220423021 has 24 divisors (see below), whose sum is σ = 277311384. Its totient is φ = 173658240.

The previous prime is 220423019. The next prime is 220423033. The reversal of 220423021 is 120324022.

It can be written as a sum of positive squares in 4 ways, for example, as 95765796 + 124657225 = 9786^2 + 11165^2 .

It is not a de Polignac number, because 220423021 - 2¹ = 220423019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220422986 and 220423004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220423061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 186051 + ... + 187231.

It is an arithmetic number, because the mean of its divisors is an integer number (11554641).

Almost surely, 2^220423021 is an apocalyptic number.

It is an amenable number.

220423021 is a deficient number, since it is larger than the sum of its proper divisors (56888363).

220423021 is a wasteful number, since it uses less digits than its factorization.

220423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501 (or 1494 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 220423021 is about 14846.6501608949. The cubic root of 220423021 is about 604.0677498452.

Adding to 220423021 its reverse (120324022), we get a palindrome (340747043).

The spelling of 220423021 in words is "two hundred twenty million, four hundred twenty-three thousand, twenty-one".