921003812 has 18 divisors (see below), whose sum is σ = 1684883718. Its totient is φ = 440479072.

The previous prime is 921003793. The next prime is 921003823. The reversal of 921003812 is 218300129.

It can be written as a sum of positive squares in only one way, i.e., 465437476 + 455566336 = 21574^2 + 21344^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215513 + ... + 219744.

It is an arithmetic number, because the mean of its divisors is an integer number (93604651).

Almost surely, 2^921003812 is an apocalyptic number.

921003812 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

921003812 is a deficient number, since it is larger than the sum of its proper divisors (763879906).

921003812 is a wasteful number, since it uses less digits than its factorization.

921003812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435307 (or 435282 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 921003812 is about 30348.0446157574. The cubic root of 921003812 is about 972.9424282011.

The spelling of 921003812 in words is "nine hundred twenty-one million, three thousand, eight hundred twelve".