121100111220100 has 18 divisors (see below), whose sum is σ = 262787241347834. Its totient is φ = 48440044488000.

The previous prime is 121100111220061. The next prime is 121100111220113. The reversal of 121100111220100 is 1022111001121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 13459712256 + 121086651507844 = 116016^2 + 11003938^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 605500556001 + ... + 605500556200.

Almost surely, 2^{121100111220100} is an apocalyptic number.

121100111220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121100111220100 is an abundant number, since it is smaller than the sum of its proper divisors (141687130127734).

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

121100111220100 is a wasteful number, since it uses less digits than its factorization.

121100111220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211001112215 (or 1211001112208 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121100111220100 its reverse (1022111001121), we get a palindrome (122122222221221).

The spelling of 121100111220100 in words is "one hundred twenty-one trillion, one hundred billion, one hundred eleven million, two hundred twenty thousand, one hundred".