221791106 has 8 divisors (see below), whose sum is σ = 336695184. Its totient is φ = 109559380.

The previous prime is 221791103. The next prime is 221791109. The reversal of 221791106 is 601197122.

It is an interprime number because it is at equal distance from previous prime (221791103) and next prime (221791109).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221791103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667880 + ... + 668211.

It is an arithmetic number, because the mean of its divisors is an integer number (42086898).

Almost surely, 2^221791106 is an apocalyptic number.

221791106 is a deficient number, since it is larger than the sum of its proper divisors (114904078).

221791106 is a wasteful number, since it uses less digits than its factorization.

221791106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336176.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 221791106 is about 14892.6527522802. The cubic root of 221791106 is about 605.3149156222.

The spelling of 221791106 in words is "two hundred twenty-one million, seven hundred ninety-one thousand, one hundred six".