220020121220021 has 2 divisors, whose sum is σ = 220020121220022. Its totient is φ = 220020121220020.

The previous prime is 220020121219999. The next prime is 220020121220027. The reversal of 220020121220021 is 120022121020022.

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., 112888202512996 + 107131918707025 = 10624886^2 + 10350455^2 .

It is a cyclic number.

It is not a de Polignac number, because 220020121220021 - 2¹⁴ = 220020121203637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220020121220027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110010060610010 + 110010060610011.

It is an arithmetic number, because the mean of its divisors is an integer number (110010060610011).

Almost surely, 2^{220020121220021} is an apocalyptic number.

It is an amenable number.

220020121220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220020121220021 is an equidigital number, since it uses as much as digits as its factorization.

220020121220021 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 220020121220021 its reverse (120022121020022), we get a palindrome (340042242240043).

The spelling of 220020121220021 in words is "two hundred twenty trillion, twenty billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".