21100968929 has 2 divisors, whose sum is σ = 21100968930. Its totient is φ = 21100968928.

The previous prime is 21100968883. The next prime is 21100968943. The reversal of 21100968929 is 92986900112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14149578304 + 6951390625 = 118952^2 + 83375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100968929 - 2⁸ = 21100968673 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100968949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550484464 + 10550484465.

It is an arithmetic number, because the mean of its divisors is an integer number (10550484465).

Almost surely, 2^21100968929 is an apocalyptic number.

It is an amenable number.

21100968929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100968929 is an equidigital number, since it uses as much as digits as its factorization.

21100968929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 21100968929 in words is "twenty-one billion, one hundred million, nine hundred sixty-eight thousand, nine hundred twenty-nine".