121211121120100 has 72 divisors (see below), whose sum is σ = 289780769468736. Its totient is φ = 43640367600000.

The previous prime is 121211121120079. The next prime is 121211121120179. The reversal of 121211121120100 is 1021121112121.

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, 545393496 + ... + 545615695.

It is an arithmetic number, because the mean of its divisors is an integer number (4024732909288).

Almost surely, 2^{121211121120100} is an apocalyptic number.

121211121120100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211121120100 is an abundant number, since it is smaller than the sum of its proper divisors (168569648348636).

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

121211121120100 is a wasteful number, since it uses less digits than its factorization.

121211121120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091009317 (or 1091009310 counting only the distinct ones).

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

Adding to 121211121120100 its reverse (1021121112121), we get a palindrome (122232242232221).

The spelling of 121211121120100 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty thousand, one hundred".