222081721 has 8 divisors (see below), whose sum is σ = 236669184. Its totient is φ = 207905280.

The previous prime is 222081701. The next prime is 222081731. The reversal of 222081721 is 127180222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 222081721 - 2¹¹ = 222079673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222081701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101640 + ... + 103801.

It is an arithmetic number, because the mean of its divisors is an integer number (29583648).

Almost surely, 2^222081721 is an apocalyptic number.

It is an amenable number.

222081721 is a deficient number, since it is larger than the sum of its proper divisors (14587463).

222081721 is a wasteful number, since it uses less digits than its factorization.

222081721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205511.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 222081721 is about 14902.4065506213. The cubic root of 222081721 is about 605.5791835325.

The spelling of 222081721 in words is "two hundred twenty-two million, eighty-one thousand, seven hundred twenty-one".