1221201100112 has 40 divisors (see below), whose sum is σ = 2766973932096. Its totient is φ = 511200458496.

The previous prime is 1221201100103. The next prime is 1221201100139. The reversal of 1221201100112 is 2110011021221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126781013 + ... + 126790644.

Almost surely, 2^{1221201100112} is an apocalyptic number.

It is an amenable number.

1221201100112 is an abundant number, since it is smaller than the sum of its proper divisors (1545772831984).

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

1221201100112 is a wasteful number, since it uses less digits than its factorization.

1221201100112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253571715 (or 253571709 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221201100112 its reverse (2110011021221), we get a palindrome (3331212121333).

The spelling of 1221201100112 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred thousand, one hundred twelve".