921899012 has 6 divisors (see below), whose sum is σ = 1613323278. Its totient is φ = 460949504.

The previous prime is 921898997. The next prime is 921899021. The reversal of 921899012 is 210998129.

It can be written as a sum of positive squares in only one way, i.e., 733001476 + 188897536 = 27074^2 + 13744^2 .

It is a super-2 number, since 2×921899012² = 1699795576653152288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115237373 + ... + 115237380.

It is an arithmetic number, because the mean of its divisors is an integer number (268887213).

Almost surely, 2^921899012 is an apocalyptic number.

It is an amenable number.

921899012 is a deficient number, since it is larger than the sum of its proper divisors (691424266).

921899012 is a wasteful number, since it uses less digits than its factorization.

921899012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230474757 (or 230474755 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 921899012 is about 30362.7899245112. The cubic root of 921899012 is about 973.2575539406.

The spelling of 921899012 in words is "nine hundred twenty-one million, eight hundred ninety-nine thousand, twelve".