2121121200999 has 32 divisors (see below), whose sum is σ = 3104809473024. Its totient is φ = 1283943640320.

The previous prime is 2121121200973. The next prime is 2121121201013. The reversal of 2121121200999 is 9990021211212.

It is a happy number.

It is not a de Polignac number, because 2121121200999 - 2¹⁹ = 2121120676711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121121200949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10027459 + ... + 10236804.

It is an arithmetic number, because the mean of its divisors is an integer number (97025296032).

Almost surely, 2^{2121121200999} is an apocalyptic number.

2121121200999 is a deficient number, since it is larger than the sum of its proper divisors (983688272025).

2121121200999 is a wasteful number, since it uses less digits than its factorization.

2121121200999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20264367.

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 2121121200999 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred thousand, nine hundred ninety-nine".