222521 has 4 divisors (see below), whose sum is σ = 239652. Its totient is φ = 205392.

The previous prime is 222511. The next prime is 222527. The reversal of 222521 is 125222.

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 10000 + 212521 = 100^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 222521 - 2¹⁰ = 221497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222496 and 222505.

It is not an unprimeable number, because it can be changed into a prime (222527) 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, 8546 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (59913).

2²²²⁵²¹ is an apocalyptic number.

It is an amenable number.

222521 is a deficient number, since it is larger than the sum of its proper divisors (17131).

222521 is a wasteful number, since it uses less digits than its factorization.

222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17130.

The product of its digits is 80, while the sum is 14.

The square root of 222521 is about 471.7213160331. The cubic root of 222521 is about 60.5978200336.

Adding to 222521 its reverse (125222), we get a palindrome (347743).

The spelling of 222521 in words is "two hundred twenty-two thousand, five hundred twenty-one".