2229521 has 4 divisors (see below), whose sum is σ = 2548032. Its totient is φ = 1911012.

The previous prime is 2229503. The next prime is 2229523. The reversal of 2229521 is 1259222.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1259222 = 2 ⋅629611.

It is a cyclic number.

It is not a de Polignac number, because 2229521 - 2¹⁴ = 2213137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2229523) 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, 159245 + ... + 159258.

It is an arithmetic number, because the mean of its divisors is an integer number (637008).

2^2229521 is an apocalyptic number.

It is an amenable number.

2229521 is a deficient number, since it is larger than the sum of its proper divisors (318511).

2229521 is an equidigital number, since it uses as much as digits as its factorization.

2229521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318510.

The product of its digits is 720, while the sum is 23.

The square root of 2229521 is about 1493.1580626310. The cubic root of 2229521 is about 130.6383006534.

Subtracting from 2229521 its reverse (1259222), we obtain a cube (970299 = 99³).

The spelling of 2229521 in words is "two million, two hundred twenty-nine thousand, five hundred twenty-one".