2100120021999 has 10 divisors (see below), whose sum is σ = 3137216329280. Its totient is φ = 1400080014612.

The previous prime is 2100120021983. The next prime is 2100120022009. The reversal of 2100120021999 is 9991200210012.

It is not a de Polignac number, because 2100120021999 - 2⁴ = 2100120021983 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 (2100120021299) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12963703759 + ... + 12963703920.

It is an arithmetic number, because the mean of its divisors is an integer number (313721632928).

Almost surely, 2^{2100120021999} is an apocalyptic number.

2100120021999 is a deficient number, since it is larger than the sum of its proper divisors (1037096307281).

2100120021999 is an equidigital number, since it uses as much as digits as its factorization.

2100120021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25927407691 (or 25927407682 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 2100120021999 in words is "two trillion, one hundred billion, one hundred twenty million, twenty-one thousand, nine hundred ninety-nine".