21316259207 has 2 divisors, whose sum is σ = 21316259208. Its totient is φ = 21316259206.

The previous prime is 21316259189. The next prime is 21316259231. The reversal of 21316259207 is 70295261312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21316259207 - 2⁶ = 21316259143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21316259507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10658129603 + 10658129604.

It is an arithmetic number, because the mean of its divisors is an integer number (10658129604).

Almost surely, 2^21316259207 is an apocalyptic number.

21316259207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21316259207 is an equidigital number, since it uses as much as digits as its factorization.

21316259207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 21316259207 in words is "twenty-one billion, three hundred sixteen million, two hundred fifty-nine thousand, two hundred seven".