221000202221 has 2 divisors, whose sum is σ = 221000202222. Its totient is φ = 221000202220.

The previous prime is 221000202173. The next prime is 221000202233. The reversal of 221000202221 is 122202000122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213387639721 + 7612562500 = 461939^2 + 87250^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000202221 - 2¹⁴ = 221000185837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221000202196 and 221000202205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221000202421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500101110 + 110500101111.

It is an arithmetic number, because the mean of its divisors is an integer number (110500101111).

Almost surely, 2^221000202221 is an apocalyptic number.

It is an amenable number.

221000202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000202221 is an equidigital number, since it uses as much as digits as its factorization.

221000202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221000202221 its reverse (122202000122), we get a palindrome (343202202343).

The spelling of 221000202221 in words is "two hundred twenty-one billion, two hundred two thousand, two hundred twenty-one".