21523005314412 has 96 divisors (see below), whose sum is σ = 58949685419520. Its totient is φ = 5983613959680.

The previous prime is 21523005314381. The next prime is 21523005314413. The reversal of 21523005314412 is 21441350032512.

It is not an unprimeable number, because it can be changed into a prime (21523005314413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6939343 + ... + 9549894.

It is an arithmetic number, because the mean of its divisors is an integer number (614059223120).

Almost surely, 2^{21523005314412} is an apocalyptic number.

It is an amenable number.

21523005314412 is an abundant number, since it is smaller than the sum of its proper divisors (37426680105108).

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

21523005314412 is a wasteful number, since it uses less digits than its factorization.

21523005314412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16489671 (or 16489669 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21523005314412 its reverse (21441350032512), we get a palindrome (42964355346924).

The spelling of 21523005314412 in words is "twenty-one trillion, five hundred twenty-three billion, five million, three hundred fourteen thousand, four hundred twelve".