21216524570 has 16 divisors (see below), whose sum is σ = 39850168320. Its totient is φ = 8117626704.

The previous prime is 21216524561. The next prime is 21216524587. The reversal of 21216524570 is 7542561212.

It is a self number, because there is not a number n which added to its sum of digits gives 21216524570.

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 7 ways as a sum of consecutive naturals, for example, 46122650 + ... + 46123109.

It is an arithmetic number, because the mean of its divisors is an integer number (2490635520).

Almost surely, 2^21216524570 is an apocalyptic number.

21216524570 is a deficient number, since it is larger than the sum of its proper divisors (18633643750).

21216524570 is a wasteful number, since it uses less digits than its factorization.

21216524570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92245789.

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 21216524570 in words is "twenty-one billion, two hundred sixteen million, five hundred twenty-four thousand, five hundred seventy".