222210101221 has 2 divisors, whose sum is σ = 222210101222. Its totient is φ = 222210101220.

The previous prime is 222210101213. The next prime is 222210101261. The reversal of 222210101221 is 122101012222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209410572996 + 12799528225 = 457614^2 + 113135^2 .

It is a cyclic number.

It is not a de Polignac number, because 222210101221 - 2³ = 222210101213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222210101195 and 222210101204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222210101261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111105050610 + 111105050611.

It is an arithmetic number, because the mean of its divisors is an integer number (111105050611).

Almost surely, 2^222210101221 is an apocalyptic number.

It is an amenable number.

222210101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222210101221 is an equidigital number, since it uses as much as digits as its factorization.

222210101221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 222210101221 its reverse (122101012222), we get a palindrome (344311113443).

The spelling of 222210101221 in words is "two hundred twenty-two billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".