221668059 has 4 divisors (see below), whose sum is σ = 295557416. Its totient is φ = 147778704.

The previous prime is 221668039. The next prime is 221668061. The reversal of 221668059 is 950866122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221668059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221668009) 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, 36944674 + ... + 36944679.

It is an arithmetic number, because the mean of its divisors is an integer number (73889354).

Almost surely, 2^221668059 is an apocalyptic number.

221668059 is a deficient number, since it is larger than the sum of its proper divisors (73889357).

221668059 is an equidigital number, since it uses as much as digits as its factorization.

221668059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73889356.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 221668059 is about 14888.5210481095. The cubic root of 221668059 is about 605.2029544711.

The spelling of 221668059 in words is "two hundred twenty-one million, six hundred sixty-eight thousand, fifty-nine".