31120303030121 has 4 divisors (see below), whose sum is σ = 31136402516292. Its totient is φ = 31104203543952.

The previous prime is 31120303030099. The next prime is 31120303030177. The reversal of 31120303030121 is 12103030302113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13685294004496 + 17435009025625 = 3699364^2 + 4175525^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120303030121 - 2³⁰ = 31119229288297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31120303030093 and 31120303030102.

It is not an unprimeable number, because it can be changed into a prime (31120303030021) 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, 8049740186 + ... + 8049744051.

It is an arithmetic number, because the mean of its divisors is an integer number (7784100629073).

Almost surely, 2^{31120303030121} is an apocalyptic number.

It is an amenable number.

31120303030121 is a deficient number, since it is larger than the sum of its proper divisors (16099486171).

31120303030121 is a wasteful number, since it uses less digits than its factorization.

31120303030121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16099486170.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31120303030121 its reverse (12103030302113), we get a palindrome (43223333332234).

The spelling of 31120303030121 in words is "thirty-one trillion, one hundred twenty billion, three hundred three million, thirty thousand, one hundred twenty-one".