21131933680 has 240 divisors, whose sum is σ = 60045656832. Its totient is φ = 6863155200.

The previous prime is 21131933573. The next prime is 21131933729. The reversal of 21131933680 is 8633913112.

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, 3898332 + ... + 3903748.

Almost surely, 2^21131933680 is an apocalyptic number.

21131933680 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 21131933680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30022828416).

21131933680 is an abundant number, since it is smaller than the sum of its proper divisors (38913723152).

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

21131933680 is a wasteful number, since it uses less digits than its factorization.

21131933680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5496 (or 5479 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 21131933680 in words is "twenty-one billion, one hundred thirty-one million, nine hundred thirty-three thousand, six hundred eighty".