220310021 has 4 divisors (see below), whose sum is σ = 233269452. Its totient is φ = 207350592.

The previous prime is 220309993. The next prime is 220310023. The reversal of 220310021 is 120013022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147889921 + 72420100 = 12161^2 + 8510^2 .

It is a cyclic number.

It is not a de Polignac number, because 220310021 - 2¹⁴ = 220293637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220309984 and 220310011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220310023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6479690 + ... + 6479723.

It is an arithmetic number, because the mean of its divisors is an integer number (58317363).

Almost surely, 2^220310021 is an apocalyptic number.

It is an amenable number.

220310021 is a deficient number, since it is larger than the sum of its proper divisors (12959431).

220310021 is a wasteful number, since it uses less digits than its factorization.

220310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12959430.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 220310021 is about 14842.8441007780. The cubic root of 220310021 is about 603.9645069637.

Adding to 220310021 its reverse (120013022), we get a palindrome (340323043).

The spelling of 220310021 in words is "two hundred twenty million, three hundred ten thousand, twenty-one".