21231311626 has 48 divisors (see below), whose sum is σ = 40341088800. Its totient is φ = 8322961248.

The previous prime is 21231311609. The next prime is 21231311627. The reversal of 21231311626 is 62611313212.

It is a junction number, because it is equal to n+sod(n) for n = 21231311594 and 21231311603.

It is not an unprimeable number, because it can be changed into a prime (21231311627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142596 + ... + 250591.

It is an arithmetic number, because the mean of its divisors is an integer number (840439350).

Almost surely, 2^21231311626 is an apocalyptic number.

21231311626 is a deficient number, since it is larger than the sum of its proper divisors (19109777174).

21231311626 is a wasteful number, since it uses less digits than its factorization.

21231311626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393251 (or 393244 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

Adding to 21231311626 its reverse (62611313212), we get a palindrome (83842624838).

The spelling of 21231311626 in words is "twenty-one billion, two hundred thirty-one million, three hundred eleven thousand, six hundred twenty-six".