24639097021 has 24 divisors (see below), whose sum is σ = 31375666112. Its totient is φ = 18936244800.

The previous prime is 24639097013. The next prime is 24639097031. The reversal of 24639097021 is 12079093642.

It is not a de Polignac number, because 24639097021 - 2³ = 24639097013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (24639097031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137415 + ... + 261076.

Almost surely, 2^24639097021 is an apocalyptic number.

It is an amenable number.

24639097021 is a deficient number, since it is larger than the sum of its proper divisors (6736569091).

24639097021 is a wasteful number, since it uses less digits than its factorization.

24639097021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398593 (or 398582 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 24639097021 in words is "twenty-four billion, six hundred thirty-nine million, ninety-seven thousand, twenty-one".