1221231220112 has 40 divisors (see below), whose sum is σ = 2372790703104. Its totient is φ = 608898783104.

The previous prime is 1221231220109. The next prime is 1221231220127. The reversal of 1221231220112 is 2110221321221.

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, 35604923 + ... + 35639205.

Almost surely, 2^{1221231220112} is an apocalyptic number.

It is an amenable number.

1221231220112 is a deficient number, since it is larger than the sum of its proper divisors (1151559482992).

1221231220112 is a wasteful number, since it uses less digits than its factorization.

1221231220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40487 (or 40481 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221231220112 its reverse (2110221321221), we get a palindrome (3331452541333).

The spelling of 1221231220112 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one million, two hundred twenty thousand, one hundred twelve".