1221000020112 has 20 divisors (see below), whose sum is σ = 3154250052080. Its totient is φ = 407000006688.

The previous prime is 1221000020111. The next prime is 1221000020117. The reversal of 1221000020112 is 2110200001221.

It is a super-2 number, since 2×1221000020112² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1221000020111) 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, 12718750162 + ... + 12718750257.

It is an arithmetic number, because the mean of its divisors is an integer number (157712502604).

Almost surely, 2^{1221000020112} is an apocalyptic number.

1221000020112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221000020112 is an abundant number, since it is smaller than the sum of its proper divisors (1933250031968).

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

1221000020112 is a wasteful number, since it uses less digits than its factorization.

1221000020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25437500430 (or 25437500424 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221000020112 its reverse (2110200001221), we get a palindrome (3331200021333).

The spelling of 1221000020112 in words is "one trillion, two hundred twenty-one billion, twenty thousand, one hundred twelve".