2121889 has 16 divisors (see below), whose sum is σ = 2802816. Its totient is φ = 1555200.

The previous prime is 2121881. The next prime is 2121893. The reversal of 2121889 is 9881212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2121889 - 2³ = 2121881 is a prime.

It is a Duffinian number.

2121889 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121889.

It is not an unprimeable number, because it can be changed into a prime (2121881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (175176).

2^2121889 is an apocalyptic number.

It is an amenable number.

2121889 is a deficient number, since it is larger than the sum of its proper divisors (680927).

2121889 is a wasteful number, since it uses less digits than its factorization.

2121889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its digits is 2304, while the sum is 31.

The square root of 2121889 is about 1456.6705186829. The cubic root of 2121889 is about 128.5013096204.

The spelling of 2121889 in words is "two million, one hundred twenty-one thousand, eight hundred eighty-nine".