2165421 has 8 divisors (see below), whose sum is σ = 2941920. Its totient is φ = 1416272.

The previous prime is 2165413. The next prime is 2165453. The reversal of 2165421 is 1245612.

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

It is a cyclic number.

It is not a de Polignac number, because 2165421 - 2³ = 2165413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6651 + ... + 6968.

It is an arithmetic number, because the mean of its divisors is an integer number (367740).

2^2165421 is an apocalyptic number.

It is an amenable number.

2165421 is a deficient number, since it is larger than the sum of its proper divisors (776499).

2165421 is a wasteful number, since it uses less digits than its factorization.

2165421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13675.

The product of its digits is 480, while the sum is 21.

The square root of 2165421 is about 1471.5369516257. The cubic root of 2165421 is about 129.3741317125.

The spelling of 2165421 in words is "two million, one hundred sixty-five thousand, four hundred twenty-one".