21033311312 has 20 divisors (see below), whose sum is σ = 43886813460. Its totient is φ = 9707682048.

The previous prime is 21033311269. The next prime is 21033311333. The reversal of 21033311312 is 21311333012.

It can be written as a sum of positive squares in 2 ways, for example, as 3311311936 + 17721999376 = 57544^2 + 133124^2 .

It is a super-2 number, since 2×21033311312² (a number of 21 digits) contains 22 as substring.

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, 50560637 + ... + 50561052.

It is an arithmetic number, because the mean of its divisors is an integer number (2194340673).

Almost surely, 2^21033311312 is an apocalyptic number.

It is an amenable number.

21033311312 is an abundant number, since it is smaller than the sum of its proper divisors (22853502148).

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

21033311312 is a wasteful number, since it uses less digits than its factorization.

21033311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101121710 (or 101121704 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21033311312 its reverse (21311333012), we get a palindrome (42344644324).

The spelling of 21033311312 in words is "twenty-one billion, thirty-three million, three hundred eleven thousand, three hundred twelve".