21010515424 has 24 divisors (see below), whose sum is σ = 43797656448. Its totient is φ = 9887301120.

The previous prime is 21010515413. The next prime is 21010515437. The reversal of 21010515424 is 42451501012.

It is a congruent number.

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, 19310592 + ... + 19311679.

It is an arithmetic number, because the mean of its divisors is an integer number (1824902352).

Almost surely, 2^21010515424 is an apocalyptic number.

It is an amenable number.

21010515424 is an abundant number, since it is smaller than the sum of its proper divisors (22787141024).

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

21010515424 is a wasteful number, since it uses less digits than its factorization.

21010515424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38622298 (or 38622290 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The spelling of 21010515424 in words is "twenty-one billion, ten million, five hundred fifteen thousand, four hundred twenty-four".