1221120112000 has 64 divisors (see below), whose sum is σ = 3036009918240. Its totient is φ = 488448038400.

The previous prime is 1221120111877. The next prime is 1221120112061. The reversal of 1221120112000 is 2110211221.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1221120112000² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 38144004 + ... + 38176003.

Almost surely, 2^{1221120112000} is an apocalyptic number.

1221120112000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221120112000 is an abundant number, since it is smaller than the sum of its proper divisors (1814889806240).

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

1221120112000 is an frugal number, since it uses more digits than its factorization.

1221120112000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76320036 (or 76320014 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221120112000 its reverse (2110211221), we get a palindrome (1223230323221).

The spelling of 1221120112000 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twelve thousand".