130231021 has 4 divisors (see below), whose sum is σ = 130379392. Its totient is φ = 130082652.

The previous prime is 130231019. The next prime is 130231027. The reversal of 130231021 is 120132031.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120132031 = 1297 ⋅92623.

It is a cyclic number.

It is not a de Polignac number, because 130231021 - 2¹ = 130231019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 130230992 and 130231010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130231027) 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, 72861 + ... + 74626.

It is an arithmetic number, because the mean of its divisors is an integer number (32594848).

Almost surely, 2^130231021 is an apocalyptic number.

It is an amenable number.

130231021 is a deficient number, since it is larger than the sum of its proper divisors (148371).

130231021 is an equidigital number, since it uses as much as digits as its factorization.

130231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148370.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 130231021 is about 11411.8806951352. The cubic root of 130231021 is about 506.8796026621.

Adding to 130231021 its reverse (120132031), we get a palindrome (250363052).

It can be divided in two parts, 1302 and 31021, that added together give a palindrome (32323).

The spelling of 130231021 in words is "one hundred thirty million, two hundred thirty-one thousand, twenty-one".