20121111031312 has 20 divisors (see below), whose sum is σ = 39028903107516. Its totient is φ = 10049136035840.

The previous prime is 20121111031267. The next prime is 20121111031331. The reversal of 20121111031312 is 21313011112102.

It can be written as a sum of positive squares in 2 ways, for example, as 9897718692096 + 10223392339216 = 3146064^2 + 3197404^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20121111031312.

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, 713702953 + ... + 713731144.

Almost surely, 2^{20121111031312} is an apocalyptic number.

It is an amenable number.

20121111031312 is a deficient number, since it is larger than the sum of its proper divisors (18907792076204).

20121111031312 is a wasteful number, since it uses less digits than its factorization.

20121111031312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427434986 (or 1427434980 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 20121111031312 its reverse (21313011112102), we get a palindrome (41434122143414).

The spelling of 20121111031312 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, thirty-one thousand, three hundred twelve".