31430123021 has 4 divisors (see below), whose sum is σ = 34287406944. Its totient is φ = 28572839100.

The previous prime is 31430122949. The next prime is 31430123167. The reversal of 31430123021 is 12032103413.

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 31430123021 - 2²⁶ = 31363014157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31430122984 and 31430123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430125021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428641945 + ... + 1428641966.

It is an arithmetic number, because the mean of its divisors is an integer number (8571851736).

Almost surely, 2^31430123021 is an apocalyptic number.

It is an amenable number.

31430123021 is a deficient number, since it is larger than the sum of its proper divisors (2857283923).

31430123021 is a wasteful number, since it uses less digits than its factorization.

31430123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857283922.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31430123021 its reverse (12032103413), we get a palindrome (43462226434).

It can be divided in two parts, 31430 and 123021, that added together give a palindrome (154451).

The spelling of 31430123021 in words is "thirty-one billion, four hundred thirty million, one hundred twenty-three thousand, twenty-one".