220220002220021 has 2 divisors, whose sum is σ = 220220002220022. Its totient is φ = 220220002220020.

The previous prime is 220220002220011. The next prime is 220220002220123. The reversal of 220220002220021 is 120022200022022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189542128804900 + 30677873415121 = 13767430^2 + 5538761^2 .

It is a cyclic number.

It is not a de Polignac number, because 220220002220021 - 2⁶ = 220220002219957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220220002220011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110110001110010 + 110110001110011.

It is an arithmetic number, because the mean of its divisors is an integer number (110110001110011).

Almost surely, 2^{220220002220021} is an apocalyptic number.

It is an amenable number.

220220002220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220220002220021 is an equidigital number, since it uses as much as digits as its factorization.

220220002220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 220220002220021 its reverse (120022200022022), we get a palindrome (340242202242043).

The spelling of 220220002220021 in words is "two hundred twenty trillion, two hundred twenty billion, two million, two hundred twenty thousand, twenty-one".