221522 has 8 divisors (see below), whose sum is σ = 379776. Its totient is φ = 94932.

The previous prime is 221509. The next prime is 221537. The reversal of 221522 is 225122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 15823 = 221522 / (2 + 2 + 1 + 5 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 221497 and 221506.

It is a congruent number.

It is an unprimeable number.

221522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7898 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (47472).

2²²¹⁵²² is an apocalyptic number.

221522 is a deficient number, since it is larger than the sum of its proper divisors (158254).

221522 is a wasteful number, since it uses less digits than its factorization.

221522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15832.

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

The square root of 221522 is about 470.6612369847. The cubic root of 221522 is about 60.5070000780.

Adding to 221522 its reverse (225122), we get a palindrome (446644).

Subtracting 221522 from its reverse (225122), we obtain a square (3600 = 60²).

The spelling of 221522 in words is "two hundred twenty-one thousand, five hundred twenty-two".