121101019999 has 16 divisors (see below), whose sum is σ = 124941968640. Its totient is φ = 117321137920.

The previous prime is 121101019981. The next prime is 121101020023. The reversal of 121101019999 is 999910101121.

It is a cyclic number.

It is not a de Polignac number, because 121101019999 - 2²⁵ = 121067465567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121101019199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12909999 + ... + 12919375.

It is an arithmetic number, because the mean of its divisors is an integer number (7808873040).

Almost surely, 2^121101019999 is an apocalyptic number.

121101019999 is a deficient number, since it is larger than the sum of its proper divisors (3840948641).

121101019999 is an equidigital number, since it uses as much as digits as its factorization.

121101019999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12590.

The product of its (nonzero) digits is 13122, while the sum is 43.

The spelling of 121101019999 in words is "one hundred twenty-one billion, one hundred one million, nineteen thousand, nine hundred ninety-nine".