221720854 has 8 divisors (see below), whose sum is σ = 336010248. Its totient is φ = 109717440.

The previous prime is 221720843. The next prime is 221720867. The reversal of 221720854 is 458027122.

It is a happy number.

221720854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571252 + ... + 571639.

It is an arithmetic number, because the mean of its divisors is an integer number (42001281).

Almost surely, 2^221720854 is an apocalyptic number.

221720854 is a deficient number, since it is larger than the sum of its proper divisors (114289394).

221720854 is a wasteful number, since it uses less digits than its factorization.

221720854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142990.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 221720854 is about 14890.2939527734. The cubic root of 221720854 is about 605.2509980094.

Adding to 221720854 its reverse (458027122), we get a palindrome (679747976).

The spelling of 221720854 in words is "two hundred twenty-one million, seven hundred twenty thousand, eight hundred fifty-four".