921446820 has 96 divisors (see below), whose sum is σ = 3276268800. Its totient is φ = 210615552.

The previous prime is 921446791. The next prime is 921446879. The reversal of 921446820 is 28644129.

921446820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×921446820² = 1698128484176224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118105 + ... + 125664.

It is an arithmetic number, because the mean of its divisors is an integer number (34127800).

Almost surely, 2^921446820 is an apocalyptic number.

921446820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

921446820 is an abundant number, since it is smaller than the sum of its proper divisors (2354821980).

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

921446820 is a wasteful number, since it uses less digits than its factorization.

921446820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243794 (or 243786 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 921446820 is about 30355.3425281284. The cubic root of 921446820 is about 973.0984001179.

The spelling of 921446820 in words is "nine hundred twenty-one million, four hundred forty-six thousand, eight hundred twenty".