221313210 has 32 divisors (see below), whose sum is σ = 549469440. Its totient is φ = 56981568.

The previous prime is 221313193. The next prime is 221313227. The reversal of 221313210 is 12313122.

It is an interprime number because it is at equal distance from previous prime (221313193) and next prime (221313227).

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

It is a self number, because there is not a number n which added to its sum of digits gives 221313210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126322 + ... + 128061.

It is an arithmetic number, because the mean of its divisors is an integer number (17170920).

Almost surely, 2^221313210 is an apocalyptic number.

221313210 is an abundant number, since it is smaller than the sum of its proper divisors (328156230).

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

221313210 is a wasteful number, since it uses less digits than its factorization.

221313210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254422.

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

The square root of 221313210 is about 14876.5994098114. The cubic root of 221313210 is about 604.8798431777.

Adding to 221313210 its reverse (12313122), we get a palindrome (233626332).

The spelling of 221313210 in words is "two hundred twenty-one million, three hundred thirteen thousand, two hundred ten".