2164921 has 16 divisors (see below), whose sum is σ = 2534400. Its totient is φ = 1829520.

The previous prime is 2164919. The next prime is 2164927. The reversal of 2164921 is 1294612.

It is not a de Polignac number, because 2164921 - 2¹ = 2164919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164927) 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, 10780 + ... + 10978.

It is an arithmetic number, because the mean of its divisors is an integer number (158400).

2^2164921 is an apocalyptic number.

It is an amenable number.

2164921 is a deficient number, since it is larger than the sum of its proper divisors (369479).

2164921 is a wasteful number, since it uses less digits than its factorization.

2164921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276.

The product of its digits is 864, while the sum is 25.

The square root of 2164921 is about 1471.3670514185. The cubic root of 2164921 is about 129.3641733649.

The spelling of 2164921 in words is "two million, one hundred sixty-four thousand, nine hundred twenty-one".