21020313331312 has 40 divisors (see below), whose sum is σ = 40771882432512. Its totient is φ = 10498539998400.

The previous prime is 21020313331289. The next prime is 21020313331349. The reversal of 21020313331312 is 21313331302012.

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, 127382137 + ... + 127547047.

Almost surely, 2^{21020313331312} is an apocalyptic number.

It is an amenable number.

21020313331312 is a deficient number, since it is larger than the sum of its proper divisors (19751569101200).

21020313331312 is a wasteful number, since it uses less digits than its factorization.

21020313331312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173677 (or 173671 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21020313331312 its reverse (21313331302012), we get a palindrome (42333644633324).

The spelling of 21020313331312 in words is "twenty-one trillion, twenty billion, three hundred thirteen million, three hundred thirty-one thousand, three hundred twelve".