1221022220120 has 64 divisors (see below), whose sum is σ = 2754404028000. Its totient is φ = 487146741760.

The previous prime is 1221022220113. The next prime is 1221022220161. The reversal of 1221022220120 is 210222201221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57838607 + ... + 57859713.

Almost surely, 2^{1221022220120} is an apocalyptic number.

1221022220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221022220120 is an abundant number, since it is smaller than the sum of its proper divisors (1533381807880).

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

1221022220120 is a wasteful number, since it uses less digits than its factorization.

1221022220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24788 (or 24784 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221022220120 its reverse (210222201221), we get a palindrome (1431244421341).

The spelling of 1221022220120 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, one hundred twenty".