221382734 has 4 divisors (see below), whose sum is σ = 332074104. Its totient is φ = 110691366.

The previous prime is 221382731. The next prime is 221382767. The reversal of 221382734 is 437283122.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221382734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221382731) 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 as a sum of consecutive naturals, namely, 55345682 + ... + 55345685.

It is an arithmetic number, because the mean of its divisors is an integer number (83018526).

Almost surely, 2^221382734 is an apocalyptic number.

221382734 is a deficient number, since it is larger than the sum of its proper divisors (110691370).

221382734 is a wasteful number, since it uses less digits than its factorization.

221382734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110691369.

The product of its digits is 16128, while the sum is 32.

The square root of 221382734 is about 14878.9359162542. The cubic root of 221382734 is about 604.9431761397.

The spelling of 221382734 in words is "two hundred twenty-one million, three hundred eighty-two thousand, seven hundred thirty-four".