221022679 has 4 divisors (see below), whose sum is σ = 223050520. Its totient is φ = 218994840.

The previous prime is 221022647. The next prime is 221022701. The reversal of 221022679 is 976220122.

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

It is a cyclic number.

It is not a de Polignac number, because 221022679 - 2⁵ = 221022647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221022679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022379) 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, 1013757 + ... + 1013974.

It is an arithmetic number, because the mean of its divisors is an integer number (55762630).

Almost surely, 2^221022679 is an apocalyptic number.

221022679 is a deficient number, since it is larger than the sum of its proper divisors (2027841).

221022679 is a wasteful number, since it uses less digits than its factorization.

221022679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027840.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 221022679 is about 14866.8315050652. The cubic root of 221022679 is about 604.6150400333.

The spelling of 221022679 in words is "two hundred twenty-one million, twenty-two thousand, six hundred seventy-nine".