220433021 has 2 divisors, whose sum is σ = 220433022. Its totient is φ = 220433020.

The previous prime is 220432997. The next prime is 220433023. The reversal of 220433021 is 120334022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203376121 + 17056900 = 14261^2 + 4130^2 .

It is a cyclic number.

It is not a de Polignac number, because 220433021 - 2⁶ = 220432957 is a prime.

Together with 220433023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220433023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110216510 + 110216511.

It is an arithmetic number, because the mean of its divisors is an integer number (110216511).

Almost surely, 2^220433021 is an apocalyptic number.

It is an amenable number.

220433021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220433021 is an equidigital number, since it uses as much as digits as its factorization.

220433021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 220433021 is about 14846.9869333815. The cubic root of 220433021 is about 604.0768846837.

Adding to 220433021 its reverse (120334022), we get a palindrome (340767043).

The spelling of 220433021 in words is "two hundred twenty million, four hundred thirty-three thousand, twenty-one".