31024200121 has 4 divisors (see below), whose sum is σ = 31487247952. Its totient is φ = 30561152292.

The previous prime is 31024200113. The next prime is 31024200127. The reversal of 31024200121 is 12100242013.

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: 12100242013 = 167 ⋅72456539.

It is a cyclic number.

It is not a de Polignac number, because 31024200121 - 2³ = 31024200113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31024200095 and 31024200104.

It is not an unprimeable number, because it can be changed into a prime (31024200127) 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, 231523815 + ... + 231523948.

It is an arithmetic number, because the mean of its divisors is an integer number (7871811988).

Almost surely, 2^31024200121 is an apocalyptic number.

It is an amenable number.

31024200121 is a deficient number, since it is larger than the sum of its proper divisors (463047831).

31024200121 is an equidigital number, since it uses as much as digits as its factorization.

31024200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463047830.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31024200121 its reverse (12100242013), we get a palindrome (43124442134).

The spelling of 31024200121 in words is "thirty-one billion, twenty-four million, two hundred thousand, one hundred twenty-one".