21931427200 has 96 divisors (see below), whose sum is σ = 54237343320. Its totient is φ = 8762880000.

The previous prime is 21931427197. The next prime is 21931427233. The reversal of 21931427200 is 272413912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3359940 + ... + 3366460.

Almost surely, 2^21931427200 is an apocalyptic number.

21931427200 is a gapful number since it is divisible by the number (20) 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 21931427200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27118671660).

21931427200 is an abundant number, since it is smaller than the sum of its proper divisors (32305916120).

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

21931427200 is a wasteful number, since it uses less digits than its factorization.

21931427200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7596 (or 7579 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 21931427200 in words is "twenty-one billion, nine hundred thirty-one million, four hundred twenty-seven thousand, two hundred".