2100001209999 has 96 divisors (see below), whose sum is σ = 3606871864320. Its totient is φ = 1074487680000.

The previous prime is 2100001209953. The next prime is 2100001210007. The reversal of 2100001209999 is 9999021000012.

It is not a de Polignac number, because 2100001209999 - 2⁷ = 2100001209871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100001209999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100001209599) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 88636947 + ... + 88660635.

It is an arithmetic number, because the mean of its divisors is an integer number (37571581920).

Almost surely, 2^{2100001209999} is an apocalyptic number.

2100001209999 is a deficient number, since it is larger than the sum of its proper divisors (1506870654321).

2100001209999 is a wasteful number, since it uses less digits than its factorization.

2100001209999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24541 (or 24534 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The spelling of 2100001209999 in words is "two trillion, one hundred billion, one million, two hundred nine thousand, nine hundred ninety-nine".