221540846 has 8 divisors (see below), whose sum is σ = 335537904. Its totient is φ = 109694880.

The previous prime is 221540843. The next prime is 221540857. The reversal of 221540846 is 648045122.

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

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221540843) 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, 537515 + ... + 537926.

It is an arithmetic number, because the mean of its divisors is an integer number (41942238).

Almost surely, 2^221540846 is an apocalyptic number.

221540846 is a deficient number, since it is larger than the sum of its proper divisors (113997058).

221540846 is a wasteful number, since it uses less digits than its factorization.

221540846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075546.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 221540846 is about 14884.2482510875. The cubic root of 221540846 is about 605.0871590841.

Adding to 221540846 its reverse (648045122), we get a palindrome (869585968).

The spelling of 221540846 in words is "two hundred twenty-one million, five hundred forty thousand, eight hundred forty-six".