2121998 has 8 divisors (see below), whose sum is σ = 3193992. Its totient is φ = 1057336.

The previous prime is 2121989. The next prime is 2122009. The reversal of 2121998 is 8991212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040 + ... + 2307.

It is an arithmetic number, because the mean of its divisors is an integer number (399249).

2^2121998 is an apocalyptic number.

2121998 is a deficient number, since it is larger than the sum of its proper divisors (1071994).

2121998 is a wasteful number, since it uses less digits than its factorization.

2121998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3666.

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

The square root of 2121998 is about 1456.7079322912. The cubic root of 2121998 is about 128.5035099245.

The spelling of 2121998 in words is "two million, one hundred twenty-one thousand, nine hundred ninety-eight".