221967159 has 4 divisors (see below), whose sum is σ = 295956216. Its totient is φ = 147978104.

The previous prime is 221967133. The next prime is 221967167. The reversal of 221967159 is 951769122.

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 221967159 - 2¹⁶ = 221901623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221967159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221967199) 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, 36994524 + ... + 36994529.

It is an arithmetic number, because the mean of its divisors is an integer number (73989054).

Almost surely, 2^221967159 is an apocalyptic number.

221967159 is a deficient number, since it is larger than the sum of its proper divisors (73989057).

221967159 is an equidigital number, since it uses as much as digits as its factorization.

221967159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73989056.

The product of its digits is 68040, while the sum is 42.

The square root of 221967159 is about 14898.5623131898. The cubic root of 221967159 is about 605.4750352414.

It can be divided in two parts, 2219 and 67159, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 221967159 in words is "two hundred twenty-one million, nine hundred sixty-seven thousand, one hundred fifty-nine".