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BaseRepresentation
bin110010010001011010001111…
…001101110101101110101001
31001222211211110120222200210100
4302101122033031311232221
5212434440144140431241
62102123204244140013
764366566423620022
oct6221321715655651
91058754416880710
10221098729233321
11644a3498690585
122096a4b9097609
13964a69cca9c24
143c85342677c49
151a8644305c9b6
hexc9168f375ba9

221098729233321 has 27 divisors (see below), whose sum is σ = 322502265644247. Its totient is φ = 145965059730720.

The previous prime is 221098729233301. The next prime is 221098729233383. The reversal of 221098729233321 is 123332927890122.

The square root of 221098729233321 is 14869389.

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

221098729233321 is a `hidden beast` number, since 2 + 2 + 1 + 0 + 9 + 87 + 2 + 9 + 233 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 159885630978921 + 61213098254400 = 12644589^2 + 7823880^2 .

It is not a de Polignac number, because 221098729233321 - 25 = 221098729233289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221098729233301) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4594617141 + ... + 4594665261.

Almost surely, 2221098729233321 is an apocalyptic number.

221098729233321 is the 14869389-th square number.

221098729233321 is the 7434695-th centered octagonal number.

It is an amenable number.

221098729233321 is a deficient number, since it is larger than the sum of its proper divisors (101403536410926).

221098729233321 is an frugal number, since it uses more digits than its factorization.

221098729233321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96454 (or 48227 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 221098729233321 in words is "two hundred twenty-one trillion, ninety-eight billion, seven hundred twenty-nine million, two hundred thirty-three thousand, three hundred twenty-one".