1030431021 has 4 divisors (see below), whose sum is σ = 1373908032. Its totient is φ = 686954012.

The previous prime is 1030431001. The next prime is 1030431037. The reversal of 1030431021 is 1201340301.

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 1030431021 - 2⁶ = 1030430957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1030431001) 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, 171738501 + ... + 171738506.

It is an arithmetic number, because the mean of its divisors is an integer number (343477008).

Almost surely, 2^1030431021 is an apocalyptic number.

It is an amenable number.

1030431021 is a deficient number, since it is larger than the sum of its proper divisors (343477011).

1030431021 is an equidigital number, since it uses as much as digits as its factorization.

1030431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343477010.

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

The square root of 1030431021 is about 32100.3274282366. The cubic root of 1030431021 is about 1010.0424845705.

Adding to 1030431021 its reverse (1201340301), we get a palindrome (2231771322).

The spelling of 1030431021 in words is "one billion, thirty million, four hundred thirty-one thousand, twenty-one".