130818921 has 4 divisors (see below), whose sum is σ = 174425232. Its totient is φ = 87212612.

The previous prime is 130818901. The next prime is 130818931. The reversal of 130818921 is 129818031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 130818921 - 2¹⁴ = 130802537 is a prime.

It is a super-2 number, since 2×130818921² = 34227180183208482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (130818901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21803151 + ... + 21803156.

It is an arithmetic number, because the mean of its divisors is an integer number (43606308).

Almost surely, 2^130818921 is an apocalyptic number.

It is an amenable number.

130818921 is a deficient number, since it is larger than the sum of its proper divisors (43606311).

130818921 is an equidigital number, since it uses as much as digits as its factorization.

130818921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43606310.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 130818921 is about 11437.6099338979. The cubic root of 130818921 is about 507.6411908678.

The spelling of 130818921 in words is "one hundred thirty million, eight hundred eighteen thousand, nine hundred twenty-one".