1221120210112 has 56 divisors (see below), whose sum is σ = 2653499261952. Its totient is φ = 552944083200.

The previous prime is 1221120210109. The next prime is 1221120210131. The reversal of 1221120210112 is 2110120211221.

It is a super-2 number, since 2×1221120210112² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 3112464 + ... + 3482767.

It is an arithmetic number, because the mean of its divisors is an integer number (47383915392).

Almost surely, 2^{1221120210112} is an apocalyptic number.

It is an amenable number.

1221120210112 is an abundant number, since it is smaller than the sum of its proper divisors (1432379051840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221120210112 is a wasteful number, since it uses less digits than its factorization.

1221120210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6595517 (or 6595507 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221120210112 its reverse (2110120211221), we get a palindrome (3331240421333).

The spelling of 1221120210112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred ten thousand, one hundred twelve".