222206521 has 4 divisors (see below), whose sum is σ = 224883792. Its totient is φ = 219529252.

The previous prime is 222206513. The next prime is 222206527. The reversal of 222206521 is 125602222.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 222206521 - 2³ = 222206513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222206492 and 222206501.

It is not an unprimeable number, because it can be changed into a prime (222206527) 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, 1338511 + ... + 1338676.

It is an arithmetic number, because the mean of its divisors is an integer number (56220948).

Almost surely, 2^222206521 is an apocalyptic number.

It is an amenable number.

222206521 is a deficient number, since it is larger than the sum of its proper divisors (2677271).

222206521 is an equidigital number, since it uses as much as digits as its factorization.

222206521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677270.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 222206521 is about 14906.5932056926. The cubic root of 222206521 is about 605.6925984343.

Adding to 222206521 its reverse (125602222), we get a palindrome (347808743).

The spelling of 222206521 in words is "two hundred twenty-two million, two hundred six thousand, five hundred twenty-one".