121201121100 has 72 divisors (see below), whose sum is σ = 354147364368. Its totient is φ = 32000288000.

The previous prime is 121201121033. The next prime is 121201121113. The reversal of 121201121100 is 1121102121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1969719 + ... + 2030318.

It is an arithmetic number, because the mean of its divisors is an integer number (4918713394).

Almost surely, 2^121201121100 is an apocalyptic number.

121201121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201121100 is an abundant number, since it is smaller than the sum of its proper divisors (232946243268).

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

121201121100 is a wasteful number, since it uses less digits than its factorization.

121201121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000155 (or 4000148 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121201121100 its reverse (1121102121), we get a palindrome (122322223221).

The spelling of 121201121100 in words is "one hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred".