21463642631 has 2 divisors, whose sum is σ = 21463642632. Its totient is φ = 21463642630.

The previous prime is 21463642601. The next prime is 21463642633. The reversal of 21463642631 is 13624636412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21463642631 - 2²² = 21459448327 is a prime.

It is a super-2 number, since 2×21463642631² (a number of 21 digits) contains 22 as substring.

Together with 21463642633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21463642633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10731821315 + 10731821316.

It is an arithmetic number, because the mean of its divisors is an integer number (10731821316).

Almost surely, 2^21463642631 is an apocalyptic number.

21463642631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21463642631 is an equidigital number, since it uses as much as digits as its factorization.

21463642631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 38.

The spelling of 21463642631 in words is "twenty-one billion, four hundred sixty-three million, six hundred forty-two thousand, six hundred thirty-one".