1231220031212 has 24 divisors (see below), whose sum is σ = 2170475971776. Its totient is φ = 611093176848.

The previous prime is 1231220031203. The next prime is 1231220031229. The reversal of 1231220031212 is 2121300221321.

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, 602498 + ... + 1680905.

It is an arithmetic number, because the mean of its divisors is an integer number (90436498824).

Almost surely, 2^{1231220031212} is an apocalyptic number.

It is an amenable number.

1231220031212 is a deficient number, since it is larger than the sum of its proper divisors (939255940564).

1231220031212 is a wasteful number, since it uses less digits than its factorization.

1231220031212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284397 (or 2284395 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1231220031212 its reverse (2121300221321), we get a palindrome (3352520252533).

The spelling of 1231220031212 in words is "one trillion, two hundred thirty-one billion, two hundred twenty million, thirty-one thousand, two hundred twelve".