31010203121 has 8 divisors (see below), whose sum is σ = 32086060200. Its totient is φ = 29934782080.

The previous prime is 31010203111. The next prime is 31010203139. The reversal of 31010203121 is 12130201013.

It can be written as a sum of positive squares in 4 ways, for example, as 20639632225 + 10370570896 = 143665^2 + 101836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31010203121 - 2³⁰ = 29936461297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31010203096 and 31010203105.

It is not an unprimeable number, because it can be changed into a prime (31010203111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39125 + ... + 252093.

It is an arithmetic number, because the mean of its divisors is an integer number (4010757525).

Almost surely, 2^31010203121 is an apocalyptic number.

It is an amenable number.

31010203121 is a deficient number, since it is larger than the sum of its proper divisors (1075857079).

31010203121 is a wasteful number, since it uses less digits than its factorization.

31010203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218019.

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

Adding to 31010203121 its reverse (12130201013), we get a palindrome (43140404134).

The spelling of 31010203121 in words is "thirty-one billion, ten million, two hundred three thousand, one hundred twenty-one".