222695721 has 6 divisors (see below), whose sum is σ = 321671610. Its totient is φ = 148463808.

The previous prime is 222695717. The next prime is 222695741. The reversal of 222695721 is 127596222.

It is a happy number.

222695721 is a `hidden beast` number, since 2 + 22 + 69 + 572 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 217149696 + 5546025 = 14736^2 + 2355^2 .

It is not a de Polignac number, because 222695721 - 2² = 222695717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222695741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12371976 + ... + 12371993.

It is an arithmetic number, because the mean of its divisors is an integer number (53611935).

Almost surely, 2^222695721 is an apocalyptic number.

It is an amenable number.

222695721 is a deficient number, since it is larger than the sum of its proper divisors (98975889).

222695721 is a wasteful number, since it uses less digits than its factorization.

222695721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24743975 (or 24743972 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 222695721 is about 14922.9930308903. The cubic root of 222695721 is about 606.1367612781.

The spelling of 222695721 in words is "two hundred twenty-two million, six hundred ninety-five thousand, seven hundred twenty-one".