221231382 has 8 divisors (see below), whose sum is σ = 442462776. Its totient is φ = 73743792.

The previous prime is 221231377. The next prime is 221231389. The reversal of 221231382 is 283132122.

It is a happy number.

221231382 is digitally balanced in base 3, 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.

221231382 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231389) 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, 18435943 + ... + 18435954.

It is an arithmetic number, because the mean of its divisors is an integer number (55307847).

Almost surely, 2^221231382 is an apocalyptic number.

221231382 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221231382 is a wasteful number, since it uses less digits than its factorization.

221231382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36871902.

The product of its digits is 1152, while the sum is 24.

The square root of 221231382 is about 14873.8489302534. The cubic root of 221231382 is about 604.8052848790.

The spelling of 221231382 in words is "two hundred twenty-one million, two hundred thirty-one thousand, three hundred eighty-two".