21001022313312 has 48 divisors (see below), whose sum is σ = 55155940180992. Its totient is φ = 6996752630400.

The previous prime is 21001022313289. The next prime is 21001022313317. The reversal of 21001022313312 is 21331322010012.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001022313317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55876428 + ... + 56251019.

It is an arithmetic number, because the mean of its divisors is an integer number (1149082087104).

Almost surely, 2^{21001022313312} is an apocalyptic number.

It is an amenable number.

21001022313312 is an abundant number, since it is smaller than the sum of its proper divisors (34154917867680).

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

21001022313312 is a wasteful number, since it uses less digits than its factorization.

21001022313312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112129411 (or 112129403 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21001022313312 its reverse (21331322010012), we get a palindrome (42332344323324).

The spelling of 21001022313312 in words is "twenty-one trillion, one billion, twenty-two million, three hundred thirteen thousand, three hundred twelve".