121200122220100 has 216 divisors, whose sum is σ = 331180328977344. Its totient is φ = 37402610880000.

The previous prime is 121200122220031. The next prime is 121200122220127. The reversal of 121200122220100 is 1022221002121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 77776194 + ... + 79319206.

It is an arithmetic number, because the mean of its divisors is an integer number (1533242263784).

Almost surely, 2^{121200122220100} is an apocalyptic number.

121200122220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121200122220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165590164488672).

121200122220100 is an abundant number, since it is smaller than the sum of its proper divisors (209980206757244).

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

121200122220100 is a wasteful number, since it uses less digits than its factorization.

121200122220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543247 (or 1543139 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121200122220100 its reverse (1022221002121), we get a palindrome (122222343222221).

The spelling of 121200122220100 in words is "one hundred twenty-one trillion, two hundred billion, one hundred twenty-two million, two hundred twenty thousand, one hundred".