1220121111112 has 16 divisors (see below), whose sum is σ = 2287933481340. Its totient is φ = 610005516096.

The previous prime is 1220121111101. The next prime is 1220121111113. The reversal of 1220121111112 is 2111111210221.

It can be written as a sum of positive squares in 2 ways, for example, as 1219288557796 + 832553316 = 1104214^2 + 28854^2 .

It is not an unprimeable number, because it can be changed into a prime (1220121111113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6785643 + ... + 6963130.

Almost surely, 2^{1220121111112} is an apocalyptic number.

It is an amenable number.

1220121111112 is a deficient number, since it is larger than the sum of its proper divisors (1067812370228).

1220121111112 is a wasteful number, since it uses less digits than its factorization.

1220121111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13759872 (or 13759868 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1220121111112 its reverse (2111111210221), we get a palindrome (3331232321333).

The spelling of 1220121111112 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twelve".