21522521304 has 96 divisors (see below), whose sum is σ = 60079546800. Its totient is φ = 6956098560.

The previous prime is 21522521297. The next prime is 21522521327. The reversal of 21522521304 is 40312522512.

21522521304 is a `hidden beast` number, since 2 + 1 + 522 + 5 + 2 + 130 + 4 = 666.

It is a super-2 number, since 2×21522521304² (a number of 21 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 458812 + ... + 503540.

Almost surely, 2^21522521304 is an apocalyptic number.

21522521304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21522521304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30039773400).

21522521304 is an abundant number, since it is smaller than the sum of its proper divisors (38557025496).

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

21522521304 is a wasteful number, since it uses less digits than its factorization.

21522521304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44945 (or 44938 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21522521304 in words is "twenty-one billion, five hundred twenty-two million, five hundred twenty-one thousand, three hundred four".