21152512424 has 32 divisors (see below), whose sum is σ = 40787025120. Its totient is φ = 10279703616.

The previous prime is 21152512421. The next prime is 21152512457. The reversal of 21152512424 is 42421525112.

It is not an unprimeable number, because it can be changed into a prime (21152512421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187754 + ... + 278489.

It is an arithmetic number, because the mean of its divisors is an integer number (1274594535).

Almost surely, 2^21152512424 is an apocalyptic number.

It is an amenable number.

21152512424 is a deficient number, since it is larger than the sum of its proper divisors (19634512696).

21152512424 is a wasteful number, since it uses less digits than its factorization.

21152512424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466409 (or 466405 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The spelling of 21152512424 in words is "twenty-one billion, one hundred fifty-two million, five hundred twelve thousand, four hundred twenty-four".