221522213 has 8 divisors (see below), whose sum is σ = 249994080. Its totient is φ = 194439280.

The previous prime is 221522209. The next prime is 221522227. The reversal of 221522213 is 312225122.

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

It is a cyclic number.

It is not a de Polignac number, because 221522213 - 2² = 221522209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221522243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346895 + ... + 347532.

It is an arithmetic number, because the mean of its divisors is an integer number (31249260).

Almost surely, 2^221522213 is an apocalyptic number.

It is an amenable number.

221522213 is a deficient number, since it is larger than the sum of its proper divisors (28471867).

221522213 is a wasteful number, since it uses less digits than its factorization.

221522213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694467.

The product of its digits is 480, while the sum is 20.

The square root of 221522213 is about 14883.6223077583. The cubic root of 221522213 is about 605.0701947104.

Adding to 221522213 its reverse (312225122), we get a palindrome (533747335).

The spelling of 221522213 in words is "two hundred twenty-one million, five hundred twenty-two thousand, two hundred thirteen".