21112321312 has 24 divisors (see below), whose sum is σ = 41573521836. Its totient is φ = 10553966592.

The previous prime is 21112321273. The next prime is 21112321361. The reversal of 21112321312 is 21312321112.

It can be written as a sum of positive squares in 2 ways, for example, as 19222158736 + 1890162576 = 138644^2 + 43476^2 .

It is a super-2 number, since 2×21112321312² (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 21112321312.

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, 93708 + ... + 225844.

Almost surely, 2^21112321312 is an apocalyptic number.

It is an amenable number.

21112321312 is a deficient number, since it is larger than the sum of its proper divisors (20461200524).

21112321312 is a wasteful number, since it uses less digits than its factorization.

21112321312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137140 (or 137132 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 21112321312 its reverse (21312321112), we get a palindrome (42424642424).

The spelling of 21112321312 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-one thousand, three hundred twelve".