221611230 has 48 divisors (see below), whose sum is σ = 576926064. Its totient is φ = 59020800.

The previous prime is 221611223. The next prime is 221611253. The reversal of 221611230 is 32116122.

221611230 is a `hidden beast` number, since 2 + 21 + 611 + 2 + 30 = 666.

It is a super-2 number, since 2×221611230² = 98223074524225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129742 + ... + 131438.

It is an arithmetic number, because the mean of its divisors is an integer number (12019293).

Almost surely, 2^221611230 is an apocalyptic number.

221611230 is an abundant number, since it is smaller than the sum of its proper divisors (355314834).

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

221611230 is a wasteful number, since it uses less digits than its factorization.

221611230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161 (or 3158 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 221611230 is about 14886.6124420568. The cubic root of 221611230 is about 605.1512314603.

Adding to 221611230 its reverse (32116122), we get a palindrome (253727352).

It can be divided in two parts, 221611 and 230, that added together give a square (221841 = 471²).

The spelling of 221611230 in words is "two hundred twenty-one million, six hundred eleven thousand, two hundred thirty".