21524494608 has 160 divisors (see below), whose sum is σ = 64550332800. Its totient is φ = 6858432000.

The previous prime is 21524494591. The next prime is 21524494613. The reversal of 21524494608 is 80649442512.

It is a happy number.

21524494608 is a `hidden beast` number, since 2 + 15 + 24 + 4 + 9 + 4 + 608 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1256823 + ... + 1273833.

It is an arithmetic number, because the mean of its divisors is an integer number (403439580).

Almost surely, 2^21524494608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21524494608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32275166400).

21524494608 is an abundant number, since it is smaller than the sum of its proper divisors (43025838192).

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

21524494608 is a wasteful number, since it uses less digits than its factorization.

21524494608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17158 (or 17146 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 21524494608 in words is "twenty-one billion, five hundred twenty-four million, four hundred ninety-four thousand, six hundred eight".