21239054496 has 480 divisors, whose sum is σ = 72078249600. Its totient is φ = 6071915520.

The previous prime is 21239054387. The next prime is 21239054503. The reversal of 21239054496 is 69445093212.

21239054496 is a `hidden beast` number, since 2 + 1 + 23 + 90 + 54 + 496 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 290945916 + ... + 290945988.

It is an arithmetic number, because the mean of its divisors is an integer number (150163020).

Almost surely, 2^21239054496 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 21239054496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36039124800).

21239054496 is an abundant number, since it is smaller than the sum of its proper divisors (50839195104).

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

21239054496 is an equidigital number, since it uses as much as digits as its factorization.

21239054496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 21239054496 in words is "twenty-one billion, two hundred thirty-nine million, fifty-four thousand, four hundred ninety-six".