21445521545112 has 64 divisors (see below), whose sum is σ = 61273701676800. Its totient is φ = 6127213572480.

The previous prime is 21445521544919. The next prime is 21445521545167. The reversal of 21445521545112 is 21154512554412.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13072339 + ... + 14621117.

It is an arithmetic number, because the mean of its divisors is an integer number (957401588700).

Almost surely, 2^{21445521545112} is an apocalyptic number.

It is an amenable number.

21445521545112 is an abundant number, since it is smaller than the sum of its proper divisors (39828180131688).

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

21445521545112 is a wasteful number, since it uses less digits than its factorization.

21445521545112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631216 (or 1631212 counting only the distinct ones).

The product of its digits is 320000, while the sum is 42.

The spelling of 21445521545112 in words is "twenty-one trillion, four hundred forty-five billion, five hundred twenty-one million, five hundred forty-five thousand, one hundred twelve".