220571834458921 has 15 divisors (see below), whose sum is σ = 242629488129415. Its totient is φ = 200518215825400.

The previous prime is 220571834458879. The next prime is 220571834458933. The reversal of 220571834458921 is 129854438175022.

The square root of 220571834458921 is 14851661.

It is a perfect power (a square), and thus also a powerful number.

220571834458921 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 only one way, i.e., 199363414791321 + 21208419667600 = 14119611^2 + 4605260^2 .

It is not a de Polignac number, because 220571834458921 - 2³¹ = 220569686975273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220571834458921.

It is not an unprimeable number, because it can be changed into a prime (220571834458961) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1796989611 + ... + 1797112351.

Almost surely, 2^{220571834458921} is an apocalyptic number.

220571834458921 is the 14851661-st square number.

220571834458921 is the 7425831-st centered octagonal number.

It is an amenable number.

220571834458921 is a deficient number, since it is larger than the sum of its proper divisors (22057653670494).

220571834458921 is an frugal number, since it uses more digits than its factorization.

220571834458921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245526 (or 122752 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 61.

The spelling of 220571834458921 in words is "two hundred twenty trillion, five hundred seventy-one billion, eight hundred thirty-four million, four hundred fifty-eight thousand, nine hundred twenty-one".