121221101211100 has 36 divisors (see below), whose sum is σ = 286963406869608. Its totient is φ = 44080400440000.

The previous prime is 121221101211053. The next prime is 121221101211227. The reversal of 121221101211100 is 1112101122121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55100499451 + ... + 55100501650.

It is an arithmetic number, because the mean of its divisors is an integer number (7971205746378).

Almost surely, 2^{121221101211100} is an apocalyptic number.

121221101211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221101211100 is an abundant number, since it is smaller than the sum of its proper divisors (165742305658508).

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

121221101211100 is a wasteful number, since it uses less digits than its factorization.

121221101211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110201001126 (or 110201001119 counting only the distinct ones).

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

Adding to 121221101211100 its reverse (1112101122121), we get a palindrome (122333202333221).

The spelling of 121221101211100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred".