2120999 has 4 divisors (see below), whose sum is σ = 2130336. Its totient is φ = 2111664.

The previous prime is 2120981. The next prime is 2121011. The reversal of 2120999 is 9990212.

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 2120999 - 2¹² = 2116903 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 (2120099) 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, 4319 + ... + 4784.

It is an arithmetic number, because the mean of its divisors is an integer number (532584).

2^2120999 is an apocalyptic number.

2120999 is a deficient number, since it is larger than the sum of its proper divisors (9337).

2120999 is an equidigital number, since it uses as much as digits as its factorization.

2120999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9336.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 2120999 is about 1456.3649954596. The cubic root of 2120999 is about 128.4833410149.

The spelling of 2120999 in words is "two million, one hundred twenty thousand, nine hundred ninety-nine".