21725033408 has 28 divisors (see below), whose sum is σ = 46426815960. Its totient is φ = 10026938112.

The previous prime is 21725033377. The next prime is 21725033437. The reversal of 21725033408 is 80433052712.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13055078 + ... + 13056741.

It is an arithmetic number, because the mean of its divisors is an integer number (1658100570).

Almost surely, 2^21725033408 is an apocalyptic number.

It is an amenable number.

21725033408 is an abundant number, since it is smaller than the sum of its proper divisors (24701782552).

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

21725033408 is a wasteful number, since it uses less digits than its factorization.

21725033408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26111844 (or 26111834 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21725033408 in words is "twenty-one billion, seven hundred twenty-five million, thirty-three thousand, four hundred eight".