221231206 has 16 divisors (see below), whose sum is σ = 382242816. Its totient is φ = 94066056.

The previous prime is 221231191. The next prime is 221231207. The reversal of 221231206 is 602132122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221231207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60436 + ... + 63991.

It is an arithmetic number, because the mean of its divisors is an integer number (23890176).

Almost surely, 2^221231206 is an apocalyptic number.

221231206 is a deficient number, since it is larger than the sum of its proper divisors (161011610).

221231206 is a wasteful number, since it uses less digits than its factorization.

221231206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124563.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 221231206 is about 14873.8430138280. The cubic root of 221231206 is about 604.8051244952.

Adding to 221231206 its reverse (602132122), we get a palindrome (823363328).

The spelling of 221231206 in words is "two hundred twenty-one million, two hundred thirty-one thousand, two hundred six".