220701704521 has 9 divisors (see below), whose sum is σ = 226845695349. Its totient is φ = 214719881184.

The previous prime is 220701704501. The next prime is 220701704527. The reversal of 220701704521 is 125407107022.

The square root of 220701704521 is 469789.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4197614521 + 216504090000 = 64789^2 + 465300^2 .

It is not a de Polignac number, because 220701704521 - 2¹⁹ = 220701180233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220701704527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17375845 + ... + 17388541.

It is an arithmetic number, because the mean of its divisors is an integer number (25205077261).

Almost surely, 2^220701704521 is an apocalyptic number.

220701704521 is the 469789-th square number.

220701704521 is the 234895-th centered octagonal number.

It is an amenable number.

220701704521 is a deficient number, since it is larger than the sum of its proper divisors (6143990828).

220701704521 is an frugal number, since it uses more digits than its factorization.

220701704521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25468 (or 12734 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The spelling of 220701704521 in words is "two hundred twenty billion, seven hundred one million, seven hundred four thousand, five hundred twenty-one".