221749234 has 8 divisors (see below), whose sum is σ = 380141568. Its totient is φ = 95035380.

The previous prime is 221749223. The next prime is 221749249. The reversal of 221749234 is 432947122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221749234.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7919602 + ... + 7919629.

It is an arithmetic number, because the mean of its divisors is an integer number (47517696).

Almost surely, 2^221749234 is an apocalyptic number.

221749234 is a deficient number, since it is larger than the sum of its proper divisors (158392334).

221749234 is a wasteful number, since it uses less digits than its factorization.

221749234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15839240.

The product of its digits is 24192, while the sum is 34.

The square root of 221749234 is about 14891.2468920504. The cubic root of 221749234 is about 605.2768207052.

The spelling of 221749234 in words is "two hundred twenty-one million, seven hundred forty-nine thousand, two hundred thirty-four".