220222021 has 2 divisors, whose sum is σ = 220222022. Its totient is φ = 220222020.

The previous prime is 220222019. The next prime is 220222069. The reversal of 220222021 is 120222022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215208900 + 5013121 = 14670^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 220222021 - 2¹ = 220222019 is a prime.

Together with 220222019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 220221992 and 220222010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220222001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110111010 + 110111011.

It is an arithmetic number, because the mean of its divisors is an integer number (110111011).

Almost surely, 2^220222021 is an apocalyptic number.

It is an amenable number.

220222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220222021 is an equidigital number, since it uses as much as digits as its factorization.

220222021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 220222021 is about 14839.8794132567. The cubic root of 220222021 is about 603.8840809735.

Adding to 220222021 its reverse (120222022), we get a palindrome (340444043).

Subtracting from 220222021 its reverse (120222022), we obtain a palindrome (99999999).

The spelling of 220222021 in words is "two hundred twenty million, two hundred twenty-two thousand, twenty-one".