921442660920 has 80 divisors (see below), whose sum is σ = 3097071176760. Its totient is φ = 245718042048.

The previous prime is 921442660891. The next prime is 921442661053. The reversal of 921442660920 is 29066244129.

921442660920 is a `hidden beast` number, since 9 + 2 + 14 + 4 + 2 + 6 + 609 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 142194702 + ... + 142201181.

Almost surely, 2^921442660920 is an apocalyptic number.

921442660920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

921442660920 is an abundant number, since it is smaller than the sum of its proper divisors (2175628515840).

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

921442660920 is a wasteful number, since it uses less digits than its factorization.

921442660920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284395906 (or 284395893 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 921442660920 in words is "nine hundred twenty-one billion, four hundred forty-two million, six hundred sixty thousand, nine hundred twenty".