21153552424 has 16 divisors (see below), whose sum is σ = 39665556000. Its totient is φ = 10576070832.

The previous prime is 21153552403. The next prime is 21153552437. The reversal of 21153552424 is 42425535112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21153552424.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52477 + ... + 212275.

It is an arithmetic number, because the mean of its divisors is an integer number (2479097250).

Almost surely, 2^21153552424 is an apocalyptic number.

It is an amenable number.

21153552424 is a deficient number, since it is larger than the sum of its proper divisors (18512003576).

21153552424 is a wasteful number, since it uses less digits than its factorization.

21153552424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176352 (or 176348 counting only the distinct ones).

The product of its digits is 48000, while the sum is 34.

The spelling of 21153552424 in words is "twenty-one billion, one hundred fifty-three million, five hundred fifty-two thousand, four hundred twenty-four".