21312212111312 has 40 divisors (see below), whose sum is σ = 41442484564800. Its totient is φ = 10617443096832.

The previous prime is 21312212111221. The next prime is 21312212111341. The reversal of 21312212111312 is 21311121221312.

It is a super-2 number, since 2×21312212111312² (a number of 27 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 7 ways as a sum of consecutive naturals, for example, 3137828 + ... + 7243644.

It is an arithmetic number, because the mean of its divisors is an integer number (1036062114120).

Almost surely, 2^{21312212111312} is an apocalyptic number.

It is an amenable number.

21312212111312 is a deficient number, since it is larger than the sum of its proper divisors (20130272453488).

21312212111312 is a wasteful number, since it uses less digits than its factorization.

21312212111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107003 (or 4106997 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

Adding to 21312212111312 its reverse (21311121221312), we get a palindrome (42623333332624).

The spelling of 21312212111312 in words is "twenty-one trillion, three hundred twelve billion, two hundred twelve million, one hundred eleven thousand, three hundred twelve".