222045721 has 16 divisors (see below), whose sum is σ = 243991440. Its totient is φ = 201134080.

The previous prime is 222045697. The next prime is 222045727. The reversal of 222045721 is 127540222.

It can be written as a sum of positive squares in 8 ways, for example, as 23658496 + 198387225 = 4864^2 + 14085^2 .

It is a cyclic number.

It is not a de Polignac number, because 222045721 - 2⁹ = 222045209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222045727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226785 + ... + 227761.

It is an arithmetic number, because the mean of its divisors is an integer number (15249465).

Almost surely, 2^222045721 is an apocalyptic number.

It is an amenable number.

222045721 is a deficient number, since it is larger than the sum of its proper divisors (21945719).

222045721 is a wasteful number, since it uses less digits than its factorization.

222045721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 222045721 is about 14901.1986430622. The cubic root of 222045721 is about 605.5464597997.

Adding to 222045721 its reverse (127540222), we get a palindrome (349585943).

The spelling of 222045721 in words is "two hundred twenty-two million, forty-five thousand, seven hundred twenty-one".