121221022100 has 36 divisors (see below), whose sum is σ = 263576880000. Its totient is φ = 48391217760.

The previous prime is 121221022049. The next prime is 121221022127. The reversal of 121221022100 is 1220122121.

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, 1164740 + ... + 1264539.

It is an arithmetic number, because the mean of its divisors is an integer number (7321580000).

Almost surely, 2^121221022100 is an apocalyptic number.

121221022100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221022100 is an abundant number, since it is smaller than the sum of its proper divisors (142355857900).

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

121221022100 is a wasteful number, since it uses less digits than its factorization.

121221022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429792 (or 2429785 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121221022100 its reverse (1220122121), we get a palindrome (122441144221).

The spelling of 121221022100 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred".