220540521 has 16 divisors (see below), whose sum is σ = 296680320. Its totient is φ = 145720320.

The previous prime is 220540501. The next prime is 220540531. The reversal of 220540521 is 125045022.

It is a happy number.

220540521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220540521 - 2⁷ = 220540393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220540501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207331 + ... + 208391.

It is an arithmetic number, because the mean of its divisors is an integer number (18542520).

Almost surely, 2^220540521 is an apocalyptic number.

It is an amenable number.

220540521 is a deficient number, since it is larger than the sum of its proper divisors (76139799).

220540521 is a wasteful number, since it uses less digits than its factorization.

220540521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 220540521 is about 14850.6067552811. The cubic root of 220540521 is about 604.1750667549.

Adding to 220540521 its reverse (125045022), we get a palindrome (345585543).

The spelling of 220540521 in words is "two hundred twenty million, five hundred forty thousand, five hundred twenty-one".