222520521221 has 4 divisors (see below), whose sum is σ = 223650067212. Its totient is φ = 221390975232.

The previous prime is 222520521211. The next prime is 222520521227. The reversal of 222520521221 is 122125025222.

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 110596818721 + 111923702500 = 332561^2 + 334550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222520521221 is a prime.

It is a super-2 number, since 2×222520521221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222520521227) 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, 564772700 + ... + 564773093.

It is an arithmetic number, because the mean of its divisors is an integer number (55912516803).

Almost surely, 2^222520521221 is an apocalyptic number.

It is an amenable number.

222520521221 is a deficient number, since it is larger than the sum of its proper divisors (1129545991).

222520521221 is a wasteful number, since it uses less digits than its factorization.

222520521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129545990.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 222520521221 its reverse (122125025222), we get a palindrome (344645546443).

The spelling of 222520521221 in words is "two hundred twenty-two billion, five hundred twenty million, five hundred twenty-one thousand, two hundred twenty-one".