21462640231 has 2 divisors, whose sum is σ = 21462640232. Its totient is φ = 21462640230.

The previous prime is 21462640201. The next prime is 21462640253. The reversal of 21462640231 is 13204626412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21462640231 - 2²⁷ = 21328422503 is a prime.

It is a super-2 number, since 2×21462640231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21462640193 and 21462640202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21462640201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10731320115 + 10731320116.

It is an arithmetic number, because the mean of its divisors is an integer number (10731320116).

Almost surely, 2^21462640231 is an apocalyptic number.

21462640231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21462640231 is an equidigital number, since it uses as much as digits as its factorization.

21462640231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 21462640231 in words is "twenty-one billion, four hundred sixty-two million, six hundred forty thousand, two hundred thirty-one".