553820921 has 16 divisors (see below), whose sum is σ = 590742528. Its totient is φ = 518270400.

The previous prime is 553820909. The next prime is 553820947. The reversal of 553820921 is 129028355.

It is not a de Polignac number, because 553820921 - 2⁶ = 553820857 is a prime.

It is a super-2 number, since 2×553820921² = 613435225074576482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (553820021) 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, 197036 + ... + 199826.

It is an arithmetic number, because the mean of its divisors is an integer number (36921408).

Almost surely, 2^553820921 is an apocalyptic number.

It is an amenable number.

553820921 is a deficient number, since it is larger than the sum of its proper divisors (36921607).

553820921 is a wasteful number, since it uses less digits than its factorization.

553820921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 553820921 is about 23533.4001155804. The cubic root of 553820921 is about 821.2142040714.

The spelling of 553820921 in words is "five hundred fifty-three million, eight hundred twenty thousand, nine hundred twenty-one".