21210313221312 has 28 divisors (see below), whose sum is σ = 56118953731896. Its totient is φ = 7070104407040.

The previous prime is 21210313221299. The next prime is 21210313221313. The reversal of 21210313221312 is 21312231301212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21210313221313) 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, 55235190489 + ... + 55235190872.

Almost surely, 2^{21210313221312} is an apocalyptic number.

It is an amenable number.

21210313221312 is an abundant number, since it is smaller than the sum of its proper divisors (34908640510584).

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

21210313221312 is a wasteful number, since it uses less digits than its factorization.

21210313221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110470381376 (or 110470381366 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21210313221312 its reverse (21312231301212), we get a palindrome (42522544522524).

The spelling of 21210313221312 in words is "twenty-one trillion, two hundred ten billion, three hundred thirteen million, two hundred twenty-one thousand, three hundred twelve".