21250253434608 has 80 divisors (see below), whose sum is σ = 66541197638400. Its totient is φ = 6439470736320.

The previous prime is 21250253434607. The next prime is 21250253434723. The reversal of 21250253434608 is 80643435205212.

21250253434608 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 0 + 2 + 5 + 3 + 4 + 34 + 608 = 666.

It is a super-2 number, since 2×21250253434608² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250253434601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2235922588 + ... + 2235932091.

It is an arithmetic number, because the mean of its divisors is an integer number (831764970480).

Almost surely, 2^{21250253434608} is an apocalyptic number.

It is an amenable number.

21250253434608 is an abundant number, since it is smaller than the sum of its proper divisors (45290944203792).

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

21250253434608 is a wasteful number, since it uses less digits than its factorization.

21250253434608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471854707 (or 4471854695 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

The spelling of 21250253434608 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-three million, four hundred thirty-four thousand, six hundred eight".