21537014399 has 2 divisors, whose sum is σ = 21537014400. Its totient is φ = 21537014398.

The previous prime is 21537014393. The next prime is 21537014419. The reversal of 21537014399 is 99341073512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21537014399 - 2³² = 17242047103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21537014393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10768507199 + 10768507200.

It is an arithmetic number, because the mean of its divisors is an integer number (10768507200).

Almost surely, 2^21537014399 is an apocalyptic number.

21537014399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21537014399 is an equidigital number, since it uses as much as digits as its factorization.

21537014399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 21537014399 in words is "twenty-one billion, five hundred thirty-seven million, fourteen thousand, three hundred ninety-nine".