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21201312330 = 2335117138489
BaseRepresentation
bin10011101111101100…
…100101101001001010
32000201120000020222000
4103233230211221022
5321410013443310
613423441411430
71350250116132
oct235754455112
960646006860
1021201312330
118a9a651830
124138339b76
131ccb53b533
141051a77ac2
158414654c0
hex4efb25a4a

21201312330 has 64 divisors (see below), whose sum is σ = 61676553600. Its totient is φ = 5139711360.

The previous prime is 21201312311. The next prime is 21201312361. The reversal of 21201312330 is 3321310212.

21201312330 is a `hidden beast` number, since 2 + 1 + 20 + 1 + 312 + 330 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3566275 + ... + 3572214.

It is an arithmetic number, because the mean of its divisors is an integer number (963696150).

Almost surely, 221201312330 is an apocalyptic number.

21201312330 is an abundant number, since it is smaller than the sum of its proper divisors (40475241270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201312330 is a wasteful number, since it uses less digits than its factorization.

21201312330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138516 (or 7138510 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21201312330 its reverse (3321310212), we get a palindrome (24522622542).

The spelling of 21201312330 in words is "twenty-one billion, two hundred one million, three hundred twelve thousand, three hundred thirty".

Divisors: 1 2 3 5 6 9 10 11 15 18 22 27 30 33 45 54 55 66 90 99 110 135 165 198 270 297 330 495 594 990 1485 2970 7138489 14276978 21415467 35692445 42830934 64246401 71384890 78523379 107077335 128492802 157046758 192739203 214154670 235570137 321232005 385478406 392616895 471140274 642464010 706710411 785233790 963696015 1177850685 1413420822 1927392030 2120131233 2355701370 3533552055 4240262466 7067104110 10600656165 21201312330