2121899 has 4 divisors (see below), whose sum is σ = 2285136. Its totient is φ = 1958664.

The previous prime is 2121893. The next prime is 2121907. The reversal of 2121899 is 9981212.

It is a happy number.

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 2121899 - 2¹⁶ = 2056363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121893) 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, 81599 + ... + 81624.

It is an arithmetic number, because the mean of its divisors is an integer number (571284).

2^2121899 is an apocalyptic number.

2121899 is a deficient number, since it is larger than the sum of its proper divisors (163237).

2121899 is a wasteful number, since it uses less digits than its factorization.

2121899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163236.

The product of its digits is 2592, while the sum is 32.

The square root of 2121899 is about 1456.6739511641. The cubic root of 2121899 is about 128.5015114863.

The spelling of 2121899 in words is "two million, one hundred twenty-one thousand, eight hundred ninety-nine".