221916699 has 8 divisors (see below), whose sum is σ = 328765520. Its totient is φ = 147944448.

The previous prime is 221916689. The next prime is 221916703. The reversal of 221916699 is 996619122.

221916699 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 221916699 - 2⁴ = 221916683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221916619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4109542 + ... + 4109595.

It is an arithmetic number, because the mean of its divisors is an integer number (41095690).

Almost surely, 2^221916699 is an apocalyptic number.

221916699 is a deficient number, since it is larger than the sum of its proper divisors (106848821).

221916699 is an equidigital number, since it uses as much as digits as its factorization.

221916699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8219146 (or 8219140 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 221916699 is about 14896.8687649452. The cubic root of 221916699 is about 605.4291506972.

The spelling of 221916699 in words is "two hundred twenty-one million, nine hundred sixteen thousand, six hundred ninety-nine".