220101111221221 has 2 divisors, whose sum is σ = 220101111221222. Its totient is φ = 220101111221220.

The previous prime is 220101111221099. The next prime is 220101111221227. The reversal of 220101111221221 is 122122111101022.

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., 214197450456196 + 5903660765025 = 14635486^2 + 2429745^2 .

It is a cyclic number.

It is not a de Polignac number, because 220101111221221 - 2⁹ = 220101111220709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220101111221227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110050555610610 + 110050555610611.

It is an arithmetic number, because the mean of its divisors is an integer number (110050555610611).

Almost surely, 2^{220101111221221} is an apocalyptic number.

It is an amenable number.

220101111221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220101111221221 is an equidigital number, since it uses as much as digits as its factorization.

220101111221221 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 19.

Adding to 220101111221221 its reverse (122122111101022), we get a palindrome (342223222322243).

The spelling of 220101111221221 in words is "two hundred twenty trillion, one hundred one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-one".