121021100121200 has 120 divisors (see below), whose sum is σ = 295738957388160. Its totient is φ = 47578664492800.

The previous prime is 121021100121199. The next prime is 121021100121221. The reversal of 121021100121200 is 2121001120121.

It is a super-2 number, since 2×121021100121200² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120971045 + ... + 121967355.

It is an arithmetic number, because the mean of its divisors is an integer number (2464491311568).

Almost surely, 2^{121021100121200} is an apocalyptic number.

121021100121200 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 121021100121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147869478694080).

121021100121200 is an abundant number, since it is smaller than the sum of its proper divisors (174717857266960).

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

121021100121200 is a wasteful number, since it uses less digits than its factorization.

121021100121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001535 (or 1001524 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121021100121200 its reverse (2121001120121), we get a palindrome (123142101241321).

The spelling of 121021100121200 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred million, one hundred twenty-one thousand, two hundred".