30311032121 has 4 divisors (see below), whose sum is σ = 30383030244. Its totient is φ = 30239034000.

The previous prime is 30311032111. The next prime is 30311032183. The reversal of 30311032121 is 12123011303.

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 325261225 + 29985770896 = 18035^2 + 173164^2 .

It is a cyclic number.

It is not a de Polignac number, because 30311032121 - 2³⁰ = 29237290297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30311032121.

It is not an unprimeable number, because it can be changed into a prime (30311032111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35998430 + ... + 35999271.

It is an arithmetic number, because the mean of its divisors is an integer number (7595757561).

Almost surely, 2^30311032121 is an apocalyptic number.

It is an amenable number.

30311032121 is a deficient number, since it is larger than the sum of its proper divisors (71998123).

30311032121 is an equidigital number, since it uses as much as digits as its factorization.

30311032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71998122.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 30311032121 its reverse (12123011303), we get a palindrome (42434043424).

The spelling of 30311032121 in words is "thirty billion, three hundred eleven million, thirty-two thousand, one hundred twenty-one".