121220099999 has 8 divisors (see below), whose sum is σ = 124315448400. Its totient is φ = 118137309696.

The previous prime is 121220099993. The next prime is 121220100007. The reversal of 121220099999 is 999990022121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121220099999 - 2⁴ = 121220099983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220099999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220099993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3119972 + ... + 3158585.

It is an arithmetic number, because the mean of its divisors is an integer number (15539431050).

Almost surely, 2^121220099999 is an apocalyptic number.

121220099999 is a deficient number, since it is larger than the sum of its proper divisors (3095348401).

121220099999 is an equidigital number, since it uses as much as digits as its factorization.

121220099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6279049.

The product of its (nonzero) digits is 472392, while the sum is 53.

The spelling of 121220099999 in words is "one hundred twenty-one billion, two hundred twenty million, ninety-nine thousand, nine hundred ninety-nine".