221423210 has 16 divisors (see below), whose sum is σ = 399490056. Its totient is φ = 88363008.

The previous prime is 221423203. The next prime is 221423243. The reversal of 221423210 is 12324122.

221423210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 182871529 + 38551681 = 13523^2 + 6209^2 .

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, 21239 + ... + 29898.

Almost surely, 2^221423210 is an apocalyptic number.

221423210 is a deficient number, since it is larger than the sum of its proper divisors (178066846).

221423210 is a wasteful number, since it uses less digits than its factorization.

221423210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51577.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221423210 is about 14880.2960320015. The cubic root of 221423210 is about 604.9800416884.

Adding to 221423210 its reverse (12324122), we get a palindrome (233747332).

It can be divided in two parts, 22142 and 3210, that added together give a palindrome (25352).

The spelling of 221423210 in words is "two hundred twenty-one million, four hundred twenty-three thousand, two hundred ten".