2228921 has 4 divisors (see below), whose sum is σ = 2360052. Its totient is φ = 2097792.

The previous prime is 2228893. The next prime is 2228923. The reversal of 2228921 is 1298222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1073296 + 1155625 = 1036^2 + 1075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2228921 - 2¹⁴ = 2212537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2228923) 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, 65540 + ... + 65573.

It is an arithmetic number, because the mean of its divisors is an integer number (590013).

2^2228921 is an apocalyptic number.

It is an amenable number.

2228921 is a deficient number, since it is larger than the sum of its proper divisors (131131).

2228921 is a wasteful number, since it uses less digits than its factorization.

2228921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131130.

The product of its digits is 1152, while the sum is 26.

The square root of 2228921 is about 1492.9571326733. The cubic root of 2228921 is about 130.6265806452.

The spelling of 2228921 in words is "two million, two hundred twenty-eight thousand, nine hundred twenty-one".