21213231344 has 40 divisors (see below), whose sum is σ = 43320173760. Its totient is φ = 10047634688.

The previous prime is 21213231337. The next prime is 21213231353. The reversal of 21213231344 is 44313231212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406712 + ... + 455895.

It is an arithmetic number, because the mean of its divisors is an integer number (1083004344).

Almost surely, 2^21213231344 is an apocalyptic number.

It is an amenable number.

21213231344 is an abundant number, since it is smaller than the sum of its proper divisors (22106942416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213231344 is a wasteful number, since it uses less digits than its factorization.

21213231344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862697 (or 862691 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 21213231344 its reverse (44313231212), we get a palindrome (65526462556).

The spelling of 21213231344 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-one thousand, three hundred forty-four".