21525253104 has 40 divisors (see below), whose sum is σ = 56006970880. Its totient is φ = 7123462848.

The previous prime is 21525253091. The next prime is 21525253207. The reversal of 21525253104 is 40135252512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606432 + ... + 1619775.

It is an arithmetic number, because the mean of its divisors is an integer number (1400174272).

Almost surely, 2^21525253104 is an apocalyptic number.

21525253104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21525253104 is an abundant number, since it is smaller than the sum of its proper divisors (34481717776).

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

21525253104 is a wasteful number, since it uses less digits than its factorization.

21525253104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226357 (or 3226351 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21525253104 in words is "twenty-one billion, five hundred twenty-five million, two hundred fifty-three thousand, one hundred four".