21011212320312 has 32 divisors (see below), whose sum is σ = 52528150342800. Its totient is φ = 7003721501184.

The previous prime is 21011212320299. The next prime is 21011212320331. The reversal of 21011212320312 is 21302321211012.

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, 15033114 + ... + 16371222.

Almost surely, 2^{21011212320312} is an apocalyptic number.

It is an amenable number.

21011212320312 is an abundant number, since it is smaller than the sum of its proper divisors (31516938022488).

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

21011212320312 is a wasteful number, since it uses less digits than its factorization.

21011212320312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992375 (or 1992371 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21011212320312 its reverse (21302321211012), we get a palindrome (42313533531324).

The spelling of 21011212320312 in words is "twenty-one trillion, eleven billion, two hundred twelve million, three hundred twenty thousand, three hundred twelve".