221340793 has 4 divisors (see below), whose sum is σ = 223532388. Its totient is φ = 219149200.

The previous prime is 221340787. The next prime is 221340803. The reversal of 221340793 is 397043122.

221340793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 204718864 + 16621929 = 14308^2 + 4077^2 .

It is a cyclic number.

It is not a de Polignac number, because 221340793 - 2⁹ = 221340281 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221340733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095646 + ... + 1095847.

It is an arithmetic number, because the mean of its divisors is an integer number (55883097).

Almost surely, 2^221340793 is an apocalyptic number.

It is an amenable number.

221340793 is a deficient number, since it is larger than the sum of its proper divisors (2191595).

221340793 is a wasteful number, since it uses less digits than its factorization.

221340793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191594.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 221340793 is about 14877.5264409108. The cubic root of 221340793 is about 604.9049715280.

The spelling of 221340793 in words is "two hundred twenty-one million, three hundred forty thousand, seven hundred ninety-three".