1231111301212 has 24 divisors (see below), whose sum is σ = 2456651964816. Its totient is φ = 534781379328.

The previous prime is 1231111301197. The next prime is 1231111301239. The reversal of 1231111301212 is 2121031111321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231111301212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696329038 + ... + 696330805.

It is an arithmetic number, because the mean of its divisors is an integer number (102360498534).

Almost surely, 2^{1231111301212} is an apocalyptic number.

It is an amenable number.

1231111301212 is a deficient number, since it is larger than the sum of its proper divisors (1225540663604).

1231111301212 is a wasteful number, since it uses less digits than its factorization.

1231111301212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392659877 (or 1392659875 counting only the distinct ones).

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

Adding to 1231111301212 its reverse (2121031111321), we get a palindrome (3352142412533).

The spelling of 1231111301212 in words is "one trillion, two hundred thirty-one billion, one hundred eleven million, three hundred one thousand, two hundred twelve".