130431021 has 32 divisors (see below), whose sum is σ = 211350528. Its totient is φ = 69845760.

The previous prime is 130431017. The next prime is 130431053. The reversal of 130431021 is 120134031.

It is not a de Polignac number, because 130431021 - 2² = 130431017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130430021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100386 + ... + 101676.

It is an arithmetic number, because the mean of its divisors is an integer number (6604704).

Almost surely, 2^130431021 is an apocalyptic number.

It is an amenable number.

130431021 is a deficient number, since it is larger than the sum of its proper divisors (80919507).

130431021 is a wasteful number, since it uses less digits than its factorization.

130431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 130431021 is about 11420.6401309209. The cubic root of 130431021 is about 507.1389470911.

Adding to 130431021 its reverse (120134031), we get a palindrome (250565052).

The spelling of 130431021 in words is "one hundred thirty million, four hundred thirty-one thousand, twenty-one".