21747907896 has 192 divisors, whose sum is σ = 66438543360. Its totient is φ = 5886777600.

The previous prime is 21747907879. The next prime is 21747907903. The reversal of 21747907896 is 69870974712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1161021 + ... + 1179603.

It is an arithmetic number, because the mean of its divisors is an integer number (346034080).

Almost surely, 2^21747907896 is an apocalyptic number.

21747907896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21747907896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33219271680).

21747907896 is an abundant number, since it is smaller than the sum of its proper divisors (44690635464).

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

21747907896 is a wasteful number, since it uses less digits than its factorization.

21747907896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18658 (or 18643 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 60.

The spelling of 21747907896 in words is "twenty-one billion, seven hundred forty-seven million, nine hundred seven thousand, eight hundred ninety-six".