220021111217 has 2 divisors, whose sum is σ = 220021111218. Its totient is φ = 220021111216.

The previous prime is 220021111207. The next prime is 220021111223. The reversal of 220021111217 is 712111120022.

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., 215220838561 + 4800272656 = 463919^2 + 69284^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021111217 - 2⁶ = 220021111153 is a prime.

It is not a weakly prime, because it can be changed into another prime (220021111207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110010555608 + 110010555609.

It is an arithmetic number, because the mean of its divisors is an integer number (110010555609).

Almost surely, 2^220021111217 is an apocalyptic number.

It is an amenable number.

220021111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

220021111217 is an equidigital number, since it uses as much as digits as its factorization.

220021111217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 220021111217 its reverse (712111120022), we get a palindrome (932132231239).

The spelling of 220021111217 in words is "two hundred twenty billion, twenty-one million, one hundred eleven thousand, two hundred seventeen".