221031230 has 16 divisors (see below), whose sum is σ = 454692960. Its totient is φ = 75782112.

The previous prime is 221031211. The next prime is 221031247. The reversal of 221031230 is 32130122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578725 + ... + 1578864.

It is an arithmetic number, because the mean of its divisors is an integer number (28418310).

Almost surely, 2^221031230 is an apocalyptic number.

221031230 is an abundant number, since it is smaller than the sum of its proper divisors (233661730).

221031230 is a wasteful number, since it uses less digits than its factorization.

221031230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157603.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221031230 is about 14867.1190887811. The cubic root of 221031230 is about 604.6228371164.

Adding to 221031230 its reverse (32130122), we get a palindrome (253161352).

The spelling of 221031230 in words is "two hundred twenty-one million, thirty-one thousand, two hundred thirty".