21901292926969 has 2 divisors, whose sum is σ = 21901292926970. Its totient is φ = 21901292926968.

The previous prime is 21901292926939. The next prime is 21901292926973. The reversal of 21901292926969 is 96962929210912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21891515672569 + 9777254400 = 4678837^2 + 98880^2 .

It is a cyclic number.

It is not a de Polignac number, because 21901292926969 - 2⁷ = 21901292926841 is a prime.

It is a super-2 number, since 2×21901292926969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21901292926939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10950646463484 + 10950646463485.

It is an arithmetic number, because the mean of its divisors is an integer number (10950646463485).

Almost surely, 2^{21901292926969} is an apocalyptic number.

It is an amenable number.

21901292926969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21901292926969 is an equidigital number, since it uses as much as digits as its factorization.

21901292926969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34012224, while the sum is 67.

The spelling of 21901292926969 in words is "twenty-one trillion, nine hundred one billion, two hundred ninety-two million, nine hundred twenty-six thousand, nine hundred sixty-nine".