21236472576 has 108 divisors (see below), whose sum is σ = 66796427880. Its totient is φ = 6435287040.

The previous prime is 21236472571. The next prime is 21236472581. The reversal of 21236472576 is 67527463212.

21236472576 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 6 + 4 + 72 + 576 = 666.

It is an interprime number because it is at equal distance from previous prime (21236472571) and next prime (21236472581).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21236472571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393621 + ... + 444308.

Almost surely, 2^21236472576 is an apocalyptic number.

It is an amenable number.

21236472576 is an abundant number, since it is smaller than the sum of its proper divisors (45559955304).

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

21236472576 is a wasteful number, since it uses less digits than its factorization.

21236472576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837962 (or 837945 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The spelling of 21236472576 in words is "twenty-one billion, two hundred thirty-six million, four hundred seventy-two thousand, five hundred seventy-six".