213255221 has 8 divisors (see below), whose sum is σ = 224930400. Its totient is φ = 201625200.

The previous prime is 213255209. The next prime is 213255223. The reversal of 213255221 is 122552312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213255221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213255223) 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, 1355 + ... + 20696.

It is an arithmetic number, because the mean of its divisors is an integer number (28116300).

Almost surely, 2^213255221 is an apocalyptic number.

It is an amenable number.

213255221 is a deficient number, since it is larger than the sum of its proper divisors (11675179).

213255221 is a wasteful number, since it uses less digits than its factorization.

213255221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22579.

The product of its digits is 1200, while the sum is 23.

The square root of 213255221 is about 14603.2606290513. The cubic root of 213255221 is about 597.4476962672.

The spelling of 213255221 in words is "two hundred thirteen million, two hundred fifty-five thousand, two hundred twenty-one".