31030012121 has 4 divisors (see below), whose sum is σ = 31032652032. Its totient is φ = 31027372212.

The previous prime is 31030012109. The next prime is 31030012183. The reversal of 31030012121 is 12121003013.

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 31030012121 - 2³⁰ = 29956270297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31030012096 and 31030012105.

It is not an unprimeable number, because it can be changed into a prime (31030012021) 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, 1302245 + ... + 1325858.

It is an arithmetic number, because the mean of its divisors is an integer number (7758163008).

Almost surely, 2^31030012121 is an apocalyptic number.

It is an amenable number.

31030012121 is a deficient number, since it is larger than the sum of its proper divisors (2639911).

31030012121 is a wasteful number, since it uses less digits than its factorization.

31030012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2639910.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31030012121 its reverse (12121003013), we get a palindrome (43151015134).

The spelling of 31030012121 in words is "thirty-one billion, thirty million, twelve thousand, one hundred twenty-one".