121220113231100 has 144 divisors (see below), whose sum is σ = 296867373147072. Its totient is φ = 42628441405440.

The previous prime is 121220113231039. The next prime is 121220113231171. The reversal of 121220113231100 is 1132311022121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1733267 + ... + 15666666.

It is an arithmetic number, because the mean of its divisors is an integer number (2061578980188).

Almost surely, 2^{121220113231100} is an apocalyptic number.

121220113231100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220113231100 is an abundant number, since it is smaller than the sum of its proper divisors (175647259915972).

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

121220113231100 is a wasteful number, since it uses less digits than its factorization.

121220113231100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17400216 (or 17400209 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 121220113231100 its reverse (1132311022121), we get a palindrome (122352424253221).

The spelling of 121220113231100 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred thirteen million, two hundred thirty-one thousand, one hundred".