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21200120212 = 2229182759657
BaseRepresentation
bin10011101111101000…
…000010100110010100
32000201110202200200111
4103233220002212110
5321404212321322
613423400052404
71350234022435
oct235750024624
960643680614
1021200120212
118a99a08107
124137a64104
131ccb211a3b
14105184748c
158412cc177
hex4efa02994

21200120212 has 12 divisors (see below), whose sum is σ = 38379528180. Its totient is φ = 10234540736.

The previous prime is 21200120203. The next prime is 21200120213. The reversal of 21200120212 is 21202100212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9929325316 + 11270794896 = 99646^2 + 106164^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21200120192 and 21200120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200120213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91379713 + ... + 91379944.

It is an arithmetic number, because the mean of its divisors is an integer number (3198294015).

Almost surely, 221200120212 is an apocalyptic number.

It is an amenable number.

21200120212 is a deficient number, since it is larger than the sum of its proper divisors (17179407968).

21200120212 is a wasteful number, since it uses less digits than its factorization.

21200120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182759690 (or 182759688 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21200120212 its reverse (21202100212), we get a palindrome (42402220424).

The spelling of 21200120212 in words is "twenty-one billion, two hundred million, one hundred twenty thousand, two hundred twelve".

Divisors: 1 2 4 29 58 116 182759657 365519314 731038628 5300030053 10600060106 21200120212