102120121999 has 4 divisors (see below), whose sum is σ = 116708710864. Its totient is φ = 87531533136.

The previous prime is 102120121933. The next prime is 102120122057. The reversal of 102120121999 is 999121021201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102120121999 - 2¹¹ = 102120119951 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 (102120121699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7294294422 + ... + 7294294435.

It is an arithmetic number, because the mean of its divisors is an integer number (29177177716).

Almost surely, 2^102120121999 is an apocalyptic number.

102120121999 is a deficient number, since it is larger than the sum of its proper divisors (14588588865).

102120121999 is an equidigital number, since it uses as much as digits as its factorization.

102120121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14588588864.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 102120121999 in words is "one hundred two billion, one hundred twenty million, one hundred twenty-one thousand, nine hundred ninety-nine".