221266079 has 4 divisors (see below), whose sum is σ = 221346384. Its totient is φ = 221185776.

The previous prime is 221266063. The next prime is 221266099. The reversal of 221266079 is 970662122.

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 221266079 - 2⁴ = 221266063 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 (221266099) 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, 35867 + ... + 41580.

It is an arithmetic number, because the mean of its divisors is an integer number (55336596).

Almost surely, 2^221266079 is an apocalyptic number.

221266079 is a deficient number, since it is larger than the sum of its proper divisors (80305).

221266079 is an equidigital number, since it uses as much as digits as its factorization.

221266079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80304.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 221266079 is about 14875.0152604964. The cubic root of 221266079 is about 604.8369015990.

The spelling of 221266079 in words is "two hundred twenty-one million, two hundred sixty-six thousand, seventy-nine".