21726076631 has 6 divisors (see below), whose sum is σ = 25273191240. Its totient is φ = 18622351356.

The previous prime is 21726076607. The next prime is 21726076639. The reversal of 21726076631 is 13667062712.

It is not a de Polignac number, because 21726076631 - 2¹⁰ = 21726075607 is a prime.

It is a super-2 number, since 2×21726076631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726076639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221694611 + ... + 221694708.

It is an arithmetic number, because the mean of its divisors is an integer number (4212198540).

Almost surely, 2^21726076631 is an apocalyptic number.

21726076631 is a deficient number, since it is larger than the sum of its proper divisors (3547114609).

21726076631 is an equidigital number, since it uses as much as digits as its factorization.

21726076631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443389333 (or 443389326 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 21726076631 in words is "twenty-one billion, seven hundred twenty-six million, seventy-six thousand, six hundred thirty-one".