220330521 has 12 divisors (see below), whose sum is σ = 318566820. Its totient is φ = 146743200.

The previous prime is 220330519. The next prime is 220330531. The reversal of 220330521 is 125033022.

220330521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 174240000 + 46090521 = 13200^2 + 6789^2 .

It is not a de Polignac number, because 220330521 - 2¹ = 220330519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220330494 and 220330503.

It is not an unprimeable number, because it can be changed into a prime (220330511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1830 + ... + 21071.

It is an arithmetic number, because the mean of its divisors is an integer number (26547235).

Almost surely, 2^220330521 is an apocalyptic number.

It is an amenable number.

220330521 is a deficient number, since it is larger than the sum of its proper divisors (98236299).

220330521 is a wasteful number, since it uses less digits than its factorization.

220330521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23976 (or 23973 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 220330521 is about 14843.5346531748. The cubic root of 220330521 is about 603.9832394878.

Adding to 220330521 its reverse (125033022), we get a palindrome (345363543).

The spelling of 220330521 in words is "two hundred twenty million, three hundred thirty thousand, five hundred twenty-one".