220120221221 has 2 divisors, whose sum is σ = 220120221222. Its totient is φ = 220120221220.

The previous prime is 220120221169. The next prime is 220120221241. The reversal of 220120221221 is 122122021022.

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., 172000972900 + 48119248321 = 414730^2 + 219361^2 .

It is a cyclic number.

It is not a de Polignac number, because 220120221221 - 2¹⁰ = 220120220197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220120221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220120221241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060110610 + 110060110611.

It is an arithmetic number, because the mean of its divisors is an integer number (110060110611).

Almost surely, 2^220120221221 is an apocalyptic number.

It is an amenable number.

220120221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220120221221 is an equidigital number, since it uses as much as digits as its factorization.

220120221221 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 220120221221 its reverse (122122021022), we get a palindrome (342242242243).

The spelling of 220120221221 in words is "two hundred twenty billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".