221385822 has 48 divisors (see below), whose sum is σ = 522794880. Its totient is φ = 62303472.

The previous prime is 221385821. The next prime is 221385847. The reversal of 221385822 is 228583122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221385821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14079 + ... + 25317.

It is an arithmetic number, because the mean of its divisors is an integer number (10891560).

Almost surely, 2^221385822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221385822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261397440).

221385822 is an abundant number, since it is smaller than the sum of its proper divisors (301409058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221385822 is a wasteful number, since it uses less digits than its factorization.

221385822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11325 (or 11318 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 221385822 is about 14879.0396867540. The cubic root of 221385822 is about 604.9459888491.

The spelling of 221385822 in words is "two hundred twenty-one million, three hundred eighty-five thousand, eight hundred twenty-two".