221122202221 has 2 divisors, whose sum is σ = 221122202222. Its totient is φ = 221122202220.

The previous prime is 221122202209. The next prime is 221122202227. The reversal of 221122202221 is 122202221122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157300285321 + 63821916900 = 396611^2 + 252630^2 .

It is a cyclic number.

It is not a de Polignac number, because 221122202221 - 2²⁵ = 221088647789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221122202227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561101110 + 110561101111.

It is an arithmetic number, because the mean of its divisors is an integer number (110561101111).

Almost surely, 2^221122202221 is an apocalyptic number.

It is an amenable number.

221122202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221122202221 is an equidigital number, since it uses as much as digits as its factorization.

221122202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221122202221 its reverse (122202221122), we get a palindrome (343324423343).

The spelling of 221122202221 in words is "two hundred twenty-one billion, one hundred twenty-two million, two hundred two thousand, two hundred twenty-one".