31020010121 has 4 divisors (see below), whose sum is σ = 31456911744. Its totient is φ = 30583108500.

The previous prime is 31020010111. The next prime is 31020010127. The reversal of 31020010121 is 12101002013.

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: 12101002013 = 82009 ⋅147557.

It is a cyclic number.

It is not a de Polignac number, because 31020010121 - 2¹⁴ = 31019993737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020010127) 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, 218450705 + ... + 218450846.

It is an arithmetic number, because the mean of its divisors is an integer number (7864227936).

Almost surely, 2^31020010121 is an apocalyptic number.

It is an amenable number.

31020010121 is a deficient number, since it is larger than the sum of its proper divisors (436901623).

31020010121 is an equidigital number, since it uses as much as digits as its factorization.

31020010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436901622.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31020010121 its reverse (12101002013), we get a palindrome (43121012134).

The spelling of 31020010121 in words is "thirty-one billion, twenty million, ten thousand, one hundred twenty-one".