21402610392 has 64 divisors (see below), whose sum is σ = 55581688800. Its totient is φ = 6859560960.

The previous prime is 21402610381. The next prime is 21402610409. The reversal of 21402610392 is 29301620412.

It is a congruent number.

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, 103938 + ... + 231534.

Almost surely, 2^21402610392 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 21402610392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27790844400).

21402610392 is an abundant number, since it is smaller than the sum of its proper divisors (34179078408).

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

21402610392 is a wasteful number, since it uses less digits than its factorization.

21402610392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127876 (or 127872 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 21402610392 in words is "twenty-one billion, four hundred two million, six hundred ten thousand, three hundred ninety-two".