1231220331212 has 6 divisors (see below), whose sum is σ = 2154635579628. Its totient is φ = 615610165604.

The previous prime is 1231220331163. The next prime is 1231220331259. The reversal of 1231220331212 is 2121330221321.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153902541398 + ... + 153902541405.

It is an arithmetic number, because the mean of its divisors is an integer number (359105929938).

Almost surely, 2^{1231220331212} is an apocalyptic number.

It is an amenable number.

1231220331212 is a deficient number, since it is larger than the sum of its proper divisors (923415248416).

1231220331212 is a wasteful number, since it uses less digits than its factorization.

1231220331212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307805082807 (or 307805082805 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1231220331212 its reverse (2121330221321), we get a palindrome (3352550552533).

The spelling of 1231220331212 in words is "one trillion, two hundred thirty-one billion, two hundred twenty million, three hundred thirty-one thousand, two hundred twelve".