921997359360 has 1296 divisors, whose sum is σ = 4099245433920. Its totient is φ = 189169827840.

The previous prime is 921997359347. The next prime is 921997359407. The reversal of 921997359360 is 63953799129.

921997359360 is a `hidden beast` number, since 9 + 219 + 9 + 7 + 3 + 59 + 360 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 515369346 + ... + 515371134.

It is an arithmetic number, because the mean of its divisors is an integer number (3162998020).

Almost surely, 2^921997359360 is an apocalyptic number.

921997359360 is a gapful number since it is divisible by the number (90) 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 921997359360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2049622716960).

921997359360 is an abundant number, since it is smaller than the sum of its proper divisors (3177248074560).

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

921997359360 is a wasteful number, since it uses less digits than its factorization.

921997359360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924 (or 1900 counting only the distinct ones).

The product of its (nonzero) digits is 24800580, while the sum is 63.

The spelling of 921997359360 in words is "nine hundred twenty-one billion, nine hundred ninety-seven million, three hundred fifty-nine thousand, three hundred sixty".