2121202001999 has 4 divisors (see below), whose sum is σ = 2161224681336. Its totient is φ = 2081179322664.

The previous prime is 2121202001917. The next prime is 2121202002047. The reversal of 2121202001999 is 9991002021212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121202001999 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 (2121202001299) 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, 20011339589 + ... + 20011339694.

It is an arithmetic number, because the mean of its divisors is an integer number (540306170334).

Almost surely, 2^{2121202001999} is an apocalyptic number.

2121202001999 is a deficient number, since it is larger than the sum of its proper divisors (40022679337).

2121202001999 is an equidigital number, since it uses as much as digits as its factorization.

2121202001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40022679336.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 2121202001999 in words is "two trillion, one hundred twenty-one billion, two hundred two million, one thousand, nine hundred ninety-nine".