21153763524 has 24 divisors (see below), whose sum is σ = 49361185888. Its totient is φ = 7050911040.

The previous prime is 21153763513. The next prime is 21153763529. The reversal of 21153763524 is 42536735112.

It is a super-2 number, since 2×21153763524² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21153763529) by changing a digit.

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, 381579 + ... + 433485.

Almost surely, 2^21153763524 is an apocalyptic number.

It is an amenable number.

21153763524 is an abundant number, since it is smaller than the sum of its proper divisors (28207422364).

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

21153763524 is a wasteful number, since it uses less digits than its factorization.

21153763524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85875 (or 85873 counting only the distinct ones).

The product of its digits is 151200, while the sum is 39.

The spelling of 21153763524 in words is "twenty-one billion, one hundred fifty-three million, seven hundred sixty-three thousand, five hundred twenty-four".