21313425244 has 12 divisors (see below), whose sum is σ = 37380113344. Its totient is φ = 10633392864.

The previous prime is 21313425229. The next prime is 21313425253. The reversal of 21313425244 is 44252431312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5827884 + ... + 5831539.

Almost surely, 2^21313425244 is an apocalyptic number.

It is an amenable number.

21313425244 is a deficient number, since it is larger than the sum of its proper divisors (16066688100).

21313425244 is a wasteful number, since it uses less digits than its factorization.

21313425244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11659884 (or 11659882 counting only the distinct ones).

The product of its digits is 23040, while the sum is 31.

Adding to 21313425244 its reverse (44252431312), we get a palindrome (65565856556).

The spelling of 21313425244 in words is "twenty-one billion, three hundred thirteen million, four hundred twenty-five thousand, two hundred forty-four".