21796203856 has 120 divisors (see below), whose sum is σ = 51805880640. Its totient is φ = 8698641408.

The previous prime is 21796203841. The next prime is 21796203887. The reversal of 21796203856 is 65830269712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2380920 + ... + 2390056.

It is an arithmetic number, because the mean of its divisors is an integer number (431715672).

Almost surely, 2^21796203856 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 21796203856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25902940320).

21796203856 is an abundant number, since it is smaller than the sum of its proper divisors (30009676784).

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

21796203856 is a wasteful number, since it uses less digits than its factorization.

21796203856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9249 (or 9224 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 21796203856 in words is "twenty-one billion, seven hundred ninety-six million, two hundred three thousand, eight hundred fifty-six".