222210021221 has 2 divisors, whose sum is σ = 222210021222. Its totient is φ = 222210021220.

The previous prime is 222210021181. The next prime is 222210021251. The reversal of 222210021221 is 122120012222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189272853025 + 32937168196 = 435055^2 + 181486^2 .

It is a cyclic number.

It is not a de Polignac number, because 222210021221 - 2²² = 222205826917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222210021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222210021251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111105010610 + 111105010611.

It is an arithmetic number, because the mean of its divisors is an integer number (111105010611).

Almost surely, 2^222210021221 is an apocalyptic number.

It is an amenable number.

222210021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222210021221 is an equidigital number, since it uses as much as digits as its factorization.

222210021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 222210021221 its reverse (122120012222), we get a palindrome (344330033443).

The spelling of 222210021221 in words is "two hundred twenty-two billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".