121220099999999 has 128 divisors (see below), whose sum is σ = 173038349094912. Its totient is φ = 81726212874240.

The previous prime is 121220099999939. The next prime is 121220100000031. The reversal of 121220099999999 is 999999990022121.

It is a Cunningham number, because it is equal to 11010000²-1.

It is not a de Polignac number, because 121220099999999 - 2²⁴ = 121220083222783 is a prime.

121220099999999 is a modest number, since divided by 99999999 gives 1212200 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220099999939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4370955737 + ... + 4370983469.

It is an arithmetic number, because the mean of its divisors is an integer number (1351862102304).

Almost surely, 2^{121220099999999} is an apocalyptic number.

121220099999999 is a deficient number, since it is larger than the sum of its proper divisors (51818249094913).

121220099999999 is a wasteful number, since it uses less digits than its factorization.

121220099999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28825.

The product of its (nonzero) digits is 344373768, while the sum is 80.

The spelling of 121220099999999 in words is "one hundred twenty-one trillion, two hundred twenty billion, ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".