21402104624 has 80 divisors (see below), whose sum is σ = 44118604800. Its totient is φ = 10035852288.

The previous prime is 21402104611. The next prime is 21402104639. The reversal of 21402104624 is 42640120412.

It is a junction number, because it is equal to n+sod(n) for n = 21402104593 and 21402104602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10051592 + ... + 10053720.

It is an arithmetic number, because the mean of its divisors is an integer number (551482560).

Almost surely, 2^21402104624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21402104624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22059302400).

21402104624 is an abundant number, since it is smaller than the sum of its proper divisors (22716500176).

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

21402104624 is a wasteful number, since it uses less digits than its factorization.

21402104624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682 (or 2676 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The spelling of 21402104624 in words is "twenty-one billion, four hundred two million, one hundred four thousand, six hundred twenty-four".