220202121221 has 2 divisors, whose sum is σ = 220202121222. Its totient is φ = 220202121220.

The previous prime is 220202121173. The next prime is 220202121253. The reversal of 220202121221 is 122121202022.

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., 220195562500 + 6558721 = 469250^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 220202121221 - 2¹⁸ = 220201859077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220202121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220202121281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110101060610 + 110101060611.

It is an arithmetic number, because the mean of its divisors is an integer number (110101060611).

Almost surely, 2^220202121221 is an apocalyptic number.

It is an amenable number.

220202121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220202121221 is an equidigital number, since it uses as much as digits as its factorization.

220202121221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 220202121221 its reverse (122121202022), we get a palindrome (342323323243).

The spelling of 220202121221 in words is "two hundred twenty billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".