221238743 has 8 divisors (see below), whose sum is σ = 241852800. Its totient is φ = 200708280.

The previous prime is 221238739. The next prime is 221238751. The reversal of 221238743 is 347832122.

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

It is a cyclic number.

It is not a de Polignac number, because 221238743 - 2² = 221238739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221238713) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15293 + ... + 26006.

It is an arithmetic number, because the mean of its divisors is an integer number (30231600).

Almost surely, 2^221238743 is an apocalyptic number.

221238743 is a deficient number, since it is larger than the sum of its proper divisors (20614057).

221238743 is a wasteful number, since it uses less digits than its factorization.

221238743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41797.

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

The square root of 221238743 is about 14874.0963759147. The cubic root of 221238743 is about 604.8119926711.

The spelling of 221238743 in words is "two hundred twenty-one million, two hundred thirty-eight thousand, seven hundred forty-three".