21647425248 has 36 divisors (see below), whose sum is σ = 61559866368. Its totient is φ = 7215808320.

The previous prime is 21647425229. The next prime is 21647425273. The reversal of 21647425248 is 84252474612.

21647425248 is a `hidden beast` number, since 21 + 64 + 7 + 42 + 524 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21647425248² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37582048 + ... + 37582623.

It is an arithmetic number, because the mean of its divisors is an integer number (1709996288).

Almost surely, 2^21647425248 is an apocalyptic number.

It is an amenable number.

21647425248 is an abundant number, since it is smaller than the sum of its proper divisors (39912441120).

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

21647425248 is a wasteful number, since it uses less digits than its factorization.

21647425248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75164687 (or 75164676 counting only the distinct ones).

The product of its digits is 860160, while the sum is 45.

The spelling of 21647425248 in words is "twenty-one billion, six hundred forty-seven million, four hundred twenty-five thousand, two hundred forty-eight".