1221011200120 has 16 divisors (see below), whose sum is σ = 2747275200360. Its totient is φ = 488404480032.

The previous prime is 1221011200099. The next prime is 1221011200177. The reversal of 1221011200120 is 210021101221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221011200120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15262639962 + ... + 15262640041.

Almost surely, 2^{1221011200120} is an apocalyptic number.

1221011200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221011200120 is an abundant number, since it is smaller than the sum of its proper divisors (1526264000240).

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

1221011200120 is a wasteful number, since it uses less digits than its factorization.

1221011200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30525280014 (or 30525280010 counting only the distinct ones).

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

Adding to 1221011200120 its reverse (210021101221), we get a palindrome (1431032301341).

The spelling of 1221011200120 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred thousand, one hundred twenty".