21765480524 has 12 divisors (see below), whose sum is σ = 38107632024. Its totient is φ = 10877585664.

The previous prime is 21765480521. The next prime is 21765480551. The reversal of 21765480524 is 42508456712.

It is a super-2 number, since 2×21765480524² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (44) 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 (21765480521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1279142 + ... + 1296045.

It is an arithmetic number, because the mean of its divisors is an integer number (3175636002).

Almost surely, 2^21765480524 is an apocalyptic number.

It is an amenable number.

21765480524 is a deficient number, since it is larger than the sum of its proper divisors (16342151500).

21765480524 is a wasteful number, since it uses less digits than its factorization.

21765480524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577304 (or 2577302 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 44.

The spelling of 21765480524 in words is "twenty-one billion, seven hundred sixty-five million, four hundred eighty thousand, five hundred twenty-four".