30311213121 has 64 divisors (see below), whose sum is σ = 53094182400. Its totient is φ = 16730496000.

The previous prime is 30311213117. The next prime is 30311213131. The reversal of 30311213121 is 12131211303.

It is not a de Polignac number, because 30311213121 - 2² = 30311213117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30311213094 and 30311213103.

It is not an unprimeable number, because it can be changed into a prime (30311213131) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 763285 + ... + 802013.

It is an arithmetic number, because the mean of its divisors is an integer number (829596600).

Almost surely, 2^30311213121 is an apocalyptic number.

It is an amenable number.

30311213121 is a deficient number, since it is larger than the sum of its proper divisors (22782969279).

30311213121 is a wasteful number, since it uses less digits than its factorization.

30311213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38887 (or 38881 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 30311213121 its reverse (12131211303), we get a palindrome (42442424424).

The spelling of 30311213121 in words is "thirty billion, three hundred eleven million, two hundred thirteen thousand, one hundred twenty-one".