220102211221 has 2 divisors, whose sum is σ = 220102211222. Its totient is φ = 220102211220.

The previous prime is 220102211117. The next prime is 220102211243. The reversal of 220102211221 is 122112201022.

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., 176374800900 + 43727410321 = 419970^2 + 209111^2 .

It is a cyclic number.

It is not a de Polignac number, because 220102211221 - 2¹⁵ = 220102178453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220102211195 and 220102211204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220102211321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110051105610 + 110051105611.

It is an arithmetic number, because the mean of its divisors is an integer number (110051105611).

Almost surely, 2^220102211221 is an apocalyptic number.

It is an amenable number.

220102211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220102211221 is an equidigital number, since it uses as much as digits as its factorization.

220102211221 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 16.

Adding to 220102211221 its reverse (122112201022), we get a palindrome (342214412243).

The spelling of 220102211221 in words is "two hundred twenty billion, one hundred two million, two hundred eleven thousand, two hundred twenty-one".