1220121122100 has 36 divisors (see below), whose sum is σ = 3530217114144. Its totient is φ = 325365632480.

The previous prime is 1220121122081. The next prime is 1220121122123. The reversal of 1220121122100 is 12211210221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1220121122100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2033534904 + ... + 2033535503.

It is an arithmetic number, because the mean of its divisors is an integer number (98061586504).

Almost surely, 2^{1220121122100} is an apocalyptic number.

1220121122100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220121122100 is an abundant number, since it is smaller than the sum of its proper divisors (2310095992044).

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

1220121122100 is a wasteful number, since it uses less digits than its factorization.

1220121122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067070424 (or 4067070417 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1220121122100 its reverse (12211210221), we get a palindrome (1232332332321).

The spelling of 1220121122100 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred".