221263743 has 4 divisors (see below), whose sum is σ = 295018328. Its totient is φ = 147509160.

The previous prime is 221263739. The next prime is 221263751. The reversal of 221263743 is 347362122.

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

It is not a de Polignac number, because 221263743 - 2² = 221263739 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221263743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221263723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36877288 + ... + 36877293.

It is an arithmetic number, because the mean of its divisors is an integer number (73754582).

Almost surely, 2^221263743 is an apocalyptic number.

221263743 is a deficient number, since it is larger than the sum of its proper divisors (73754585).

221263743 is an equidigital number, since it uses as much as digits as its factorization.

221263743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73754584.

The product of its digits is 12096, while the sum is 30.

The square root of 221263743 is about 14874.9367393613. The cubic root of 221263743 is about 604.8347730848.

The spelling of 221263743 in words is "two hundred twenty-one million, two hundred sixty-three thousand, seven hundred forty-three".