213535221 has 8 divisors (see below), whose sum is σ = 284783520. Its totient is φ = 142321872.

The previous prime is 213535199. The next prime is 213535271. The reversal of 213535221 is 122535312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213535221 - 2²¹ = 211438069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213535191 and 213535200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213535271) 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, 13906 + ... + 24908.

It is an arithmetic number, because the mean of its divisors is an integer number (35597940).

Almost surely, 2^213535221 is an apocalyptic number.

It is an amenable number.

213535221 is a deficient number, since it is larger than the sum of its proper divisors (71248299).

213535221 is a wasteful number, since it uses less digits than its factorization.

213535221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17475.

The product of its digits is 1800, while the sum is 24.

The square root of 213535221 is about 14612.8443843079. The cubic root of 213535221 is about 597.7090610197.

Subtracting from 213535221 its reverse (122535312), we obtain a palindrome (90999909).

The spelling of 213535221 in words is "two hundred thirteen million, five hundred thirty-five thousand, two hundred twenty-one".