221010210 has 48 divisors (see below), whose sum is σ = 578518200. Its totient is φ = 58536960.

The previous prime is 221010187. The next prime is 221010241. The reversal of 221010210 is 12010122.

It can be written as a sum of positive squares in 4 ways, for example, as 122345721 + 98664489 = 11061^2 + 9933^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 221010192 and 221010201.

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, 5170 + ... + 21650.

Almost surely, 2^221010210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221010210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289259100).

221010210 is an abundant number, since it is smaller than the sum of its proper divisors (357507990).

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

221010210 is a wasteful number, since it uses less digits than its factorization.

221010210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16643 (or 16640 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221010210 is about 14866.4121428137. The cubic root of 221010210 is about 604.6036700286.

Adding to 221010210 its reverse (12010122), we get a palindrome (233020332).

The spelling of 221010210 in words is "two hundred twenty-one million, ten thousand, two hundred ten".