221322679 has 4 divisors (see below), whose sum is σ = 221428384. Its totient is φ = 221216976.

The previous prime is 221322649. The next prime is 221322683. The reversal of 221322679 is 976223122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221322679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221322649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49647 + ... + 53920.

It is an arithmetic number, because the mean of its divisors is an integer number (55357096).

Almost surely, 2^221322679 is an apocalyptic number.

221322679 is a deficient number, since it is larger than the sum of its proper divisors (105705).

221322679 is a wasteful number, since it uses less digits than its factorization.

221322679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105704.

The product of its digits is 18144, while the sum is 34.

The square root of 221322679 is about 14876.9176579021. The cubic root of 221322679 is about 604.8884697535. Note that the first 3 decimals are identical.

The spelling of 221322679 in words is "two hundred twenty-one million, three hundred twenty-two thousand, six hundred seventy-nine".