220066621 has 4 divisors (see below), whose sum is σ = 220575292. Its totient is φ = 219557952.

The previous prime is 220066619. The next prime is 220066657. The reversal of 220066621 is 126660022.

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 116942596 + 103124025 = 10814^2 + 10155^2 .

It is a cyclic number.

It is not a de Polignac number, because 220066621 - 2¹ = 220066619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220006621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253686 + ... + 254551.

It is an arithmetic number, because the mean of its divisors is an integer number (55143823).

Almost surely, 2^220066621 is an apocalyptic number.

It is an amenable number.

220066621 is a deficient number, since it is larger than the sum of its proper divisors (508671).

220066621 is an equidigital number, since it uses as much as digits as its factorization.

220066621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508670.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 220066621 is about 14834.6425976496. The cubic root of 220066621 is about 603.7420036462.

The spelling of 220066621 in words is "two hundred twenty million, sixty-six thousand, six hundred twenty-one".