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21212022021 = 323307420609
BaseRepresentation
bin10011110000010101…
…011100010100000101
32000202022011100220020
4103300111130110011
5321420234201041
613424503125353
71350440132541
oct236025342405
960668140806
1021212022021
118aa56a7113
12413ba43859
13200081b128
141053264a21
1584237d866
hex4f055c505

21212022021 has 8 divisors (see below), whose sum is σ = 29512378560. Its totient is φ = 13526506752.

The previous prime is 21212022019. The next prime is 21212022071. The reversal of 21212022021 is 12022021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21212022021 - 21 = 21212022019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212022071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153710236 + ... + 153710373.

It is an arithmetic number, because the mean of its divisors is an integer number (3689047320).

Almost surely, 221212022021 is an apocalyptic number.

It is an amenable number.

21212022021 is a deficient number, since it is larger than the sum of its proper divisors (8300356539).

21212022021 is a wasteful number, since it uses less digits than its factorization.

21212022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307420635.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212022021 its reverse (12022021212), we get a palindrome (33234043233).

It can be divided in two parts, 212 and 12022021, that multiplied together give a palindrome (2548668452).

The spelling of 21212022021 in words is "twenty-one billion, two hundred twelve million, twenty-two thousand, twenty-one".

Divisors: 1 3 23 69 307420609 922261827 7070674007 21212022021