220202221220021 has 2 divisors, whose sum is σ = 220202221220022. Its totient is φ = 220202221220020.

The previous prime is 220202221219961. The next prime is 220202221220063. The reversal of 220202221220021 is 120022122202022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155380238755921 + 64821982464100 = 12465161^2 + 8051210^2 .

It is a cyclic number.

It is not a de Polignac number, because 220202221220021 - 2¹⁴ = 220202221203637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220202221219975 and 220202221220002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220202221250021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110101110610010 + 110101110610011.

It is an arithmetic number, because the mean of its divisors is an integer number (110101110610011).

Almost surely, 2^{220202221220021} is an apocalyptic number.

It is an amenable number.

220202221220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220202221220021 is an equidigital number, since it uses as much as digits as its factorization.

220202221220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 220202221220021 its reverse (120022122202022), we get a palindrome (340224343422043).

The spelling of 220202221220021 in words is "two hundred twenty trillion, two hundred two billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".