30121231312 has 20 divisors (see below), whose sum is σ = 61792820676. Its totient is φ = 14174696960.

The previous prime is 30121231291. The next prime is 30121231331. The reversal of 30121231312 is 21313212103.

It can be written as a sum of positive squares in 2 ways, for example, as 17732650896 + 12388580416 = 133164^2 + 111304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30121231312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55369639 + ... + 55370182.

Almost surely, 2^30121231312 is an apocalyptic number.

It is an amenable number.

30121231312 is an abundant number, since it is smaller than the sum of its proper divisors (31671589364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30121231312 is a wasteful number, since it uses less digits than its factorization.

30121231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110739846 (or 110739840 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 30121231312 its reverse (21313212103), we get a palindrome (51434443415).

The spelling of 30121231312 in words is "thirty billion, one hundred twenty-one million, two hundred thirty-one thousand, three hundred twelve".