221513210 has 48 divisors (see below), whose sum is σ = 430901856. Its totient is φ = 81932256.

The previous prime is 221513203. The next prime is 221513233. The reversal of 221513210 is 12315122.

It is a happy number.

221513210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221513210³ (a number of 26 digits) contains 333 as substring.

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, 154517 + ... + 155943.

It is an arithmetic number, because the mean of its divisors is an integer number (8977122).

Almost surely, 2^221513210 is an apocalyptic number.

221513210 is a deficient number, since it is larger than the sum of its proper divisors (209388646).

221513210 is a wasteful number, since it uses less digits than its factorization.

221513210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 221513210 is about 14883.3198581499. The cubic root of 221513210 is about 605.0619976080.

Adding to 221513210 its reverse (12315122), we get a palindrome (233828332).

The spelling of 221513210 in words is "two hundred twenty-one million, five hundred thirteen thousand, two hundred ten".