221131230 has 32 divisors (see below), whose sum is σ = 533692800. Its totient is φ = 58637472.

The previous prime is 221131219. The next prime is 221131231. The reversal of 221131230 is 32131122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15220 + ... + 25959.

It is an arithmetic number, because the mean of its divisors is an integer number (16677900).

Almost surely, 2^221131230 is an apocalyptic number.

221131230 is an abundant number, since it is smaller than the sum of its proper divisors (312561570).

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

221131230 is a wasteful number, since it uses less digits than its factorization.

221131230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41368.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 221131230 is about 14870.4818348297. The cubic root of 221131230 is about 604.7140054817.

Adding to 221131230 its reverse (32131122), we get a palindrome (253262352).

The spelling of 221131230 in words is "two hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty".