21112303312 has 20 divisors (see below), whose sum is σ = 41050666116. Its totient is φ = 10518583040.

The previous prime is 21112303309. The next prime is 21112303319. The reversal of 21112303312 is 21330321112.

It can be written as a sum of positive squares in 2 ways, for example, as 10274660496 + 10837642816 = 101364^2 + 104104^2 .

It is a super-2 number, since 2×21112303312² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21112303312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112303319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2343403 + ... + 2352394.

Almost surely, 2^21112303312 is an apocalyptic number.

It is an amenable number.

21112303312 is a deficient number, since it is larger than the sum of its proper divisors (19938362804).

21112303312 is a wasteful number, since it uses less digits than its factorization.

21112303312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696086 (or 4696080 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21112303312 its reverse (21330321112), we get a palindrome (42442624424).

The spelling of 21112303312 in words is "twenty-one billion, one hundred twelve million, three hundred three thousand, three hundred twelve".