21525366474 has 36 divisors (see below), whose sum is σ = 47748202866. Its totient is φ = 7008248016.

The previous prime is 21525366463. The next prime is 21525366547. The reversal of 21525366474 is 47466352512.

21525366474 is a `hidden beast` number, since 2 + 1 + 52 + 536 + 64 + 7 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21061265625 + 464100849 = 145125^2 + 21543^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 290097 + ... + 356660.

Almost surely, 2^21525366474 is an apocalyptic number.

21525366474 is an abundant number, since it is smaller than the sum of its proper divisors (26222836392).

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

21525366474 is a wasteful number, since it uses less digits than its factorization.

21525366474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646851 (or 646805 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The spelling of 21525366474 in words is "twenty-one billion, five hundred twenty-five million, three hundred sixty-six thousand, four hundred seventy-four".