2162921 has 4 divisors (see below), whose sum is σ = 2166912. Its totient is φ = 2158932.

The previous prime is 2162911. The next prime is 2162929. The reversal of 2162921 is 1292612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2162921 - 2¹⁰ = 2161897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2162929) by changing a digit.

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, 1025 + ... + 2318.

It is an arithmetic number, because the mean of its divisors is an integer number (541728).

2^2162921 is an apocalyptic number.

It is an amenable number.

2162921 is a deficient number, since it is larger than the sum of its proper divisors (3991).

2162921 is an equidigital number, since it uses as much as digits as its factorization.

2162921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its digits is 432, while the sum is 23.

The square root of 2162921 is about 1470.6872543134. The cubic root of 2162921 is about 129.3243246344.

The spelling of 2162921 in words is "two million, one hundred sixty-two thousand, nine hundred twenty-one".