221222709 has 6 divisors (see below), whose sum is σ = 319543926. Its totient is φ = 147481800.

The previous prime is 221222707. The next prime is 221222711. The reversal of 221222709 is 907222122.

It is an interprime number because it is at equal distance from previous prime (221222707) and next prime (221222711).

It can be written as a sum of positive squares in only one way, i.e., 184280625 + 36942084 = 13575^2 + 6078^2 .

It is not a de Polignac number, because 221222709 - 2¹ = 221222707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222707) 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 5 ways as a sum of consecutive naturals, for example, 12290142 + ... + 12290159.

It is an arithmetic number, because the mean of its divisors is an integer number (53257321).

Almost surely, 2^221222709 is an apocalyptic number.

It is an amenable number.

221222709 is a deficient number, since it is larger than the sum of its proper divisors (98321217).

221222709 is a wasteful number, since it uses less digits than its factorization.

221222709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24580307 (or 24580304 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 221222709 is about 14873.5573754230. The cubic root of 221222709 is about 604.7973813216.

The spelling of 221222709 in words is "two hundred twenty-one million, two hundred twenty-two thousand, seven hundred nine".