2207921 has 4 divisors (see below), whose sum is σ = 2259312. Its totient is φ = 2156532.

The previous prime is 2207917. The next prime is 2207929. The reversal of 2207921 is 1297022.

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 2207921 - 2² = 2207917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2207929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25631 + ... + 25716.

It is an arithmetic number, because the mean of its divisors is an integer number (564828).

2^2207921 is an apocalyptic number.

It is an amenable number.

2207921 is a deficient number, since it is larger than the sum of its proper divisors (51391).

2207921 is an equidigital number, since it uses as much as digits as its factorization.

2207921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51390.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 2207921 is about 1485.9074668363. The cubic root of 2207921 is about 130.2150484060.

The spelling of 2207921 in words is "two million, two hundred seven thousand, nine hundred twenty-one".