900599921 has 16 divisors (see below), whose sum is σ = 985205760. Its totient is φ = 818251200.

The previous prime is 900599911. The next prime is 900599923. The reversal of 900599921 is 129995009.

It is a de Polignac number, because none of the positive numbers 2^k-900599921 is a prime.

It is a super-2 number, since 2×900599921² = 1622160435410412482, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900599923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381896 + ... + 384246.

It is an arithmetic number, because the mean of its divisors is an integer number (61575360).

Almost surely, 2^900599921 is an apocalyptic number.

It is an amenable number.

900599921 is a deficient number, since it is larger than the sum of its proper divisors (84605839).

900599921 is a wasteful number, since it uses less digits than its factorization.

900599921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816.

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 900599921 is about 30009.9970176606. The cubic root of 900599921 is about 965.7038619044.

The spelling of 900599921 in words is "nine hundred million, five hundred ninety-nine thousand, nine hundred twenty-one".