220740521 has 2 divisors, whose sum is σ = 220740522. Its totient is φ = 220740520.

The previous prime is 220740503. The next prime is 220740571. The reversal of 220740521 is 125047022.

It is a happy number.

220740521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214212496 + 6528025 = 14636^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 220740521 - 2¹⁴ = 220724137 is a prime.

It is a super-2 number, since 2×220740521² = 97452755222702882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220740571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110370260 + 110370261.

It is an arithmetic number, because the mean of its divisors is an integer number (110370261).

Almost surely, 2^220740521 is an apocalyptic number.

It is an amenable number.

220740521 is a deficient number, since it is larger than the sum of its proper divisors (1).

220740521 is an equidigital number, since it uses as much as digits as its factorization.

220740521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 220740521 is about 14857.3389609311. The cubic root of 220740521 is about 604.3576462106.

Adding to 220740521 its reverse (125047022), we get a palindrome (345787543).

The spelling of 220740521 in words is "two hundred twenty million, seven hundred forty thousand, five hundred twenty-one".