221231010 has 256 divisors, whose sum is σ = 731566080. Its totient is φ = 41333760.

The previous prime is 221231009. The next prime is 221231027. The reversal of 221231010 is 10132122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1591521 + ... + 1591659.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^221231010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221231010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365783040).

221231010 is an abundant number, since it is smaller than the sum of its proper divisors (510335070).

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

221231010 is a wasteful number, since it uses less digits than its factorization.

221231010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221231010 is about 14873.8364250788. The cubic root of 221231010 is about 604.8049458860.

Adding to 221231010 its reverse (10132122), we get a palindrome (231363132).

The spelling of 221231010 in words is "two hundred twenty-one million, two hundred thirty-one thousand, ten".