221213211 has 8 divisors (see below), whose sum is σ = 297657360. Its totient is φ = 146122272.

The previous prime is 221213183. The next prime is 221213221. The reversal of 221213211 is 112312122.

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

It is not a de Polignac number, because 221213211 - 2⁶ = 221213147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221213221) 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, 337920 + ... + 338573.

It is an arithmetic number, because the mean of its divisors is an integer number (37207170).

Almost surely, 2^221213211 is an apocalyptic number.

221213211 is a deficient number, since it is larger than the sum of its proper divisors (76444149).

221213211 is a wasteful number, since it uses less digits than its factorization.

221213211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676605.

The product of its digits is 48, while the sum is 15.

The square root of 221213211 is about 14873.2380805257. The cubic root of 221213211 is about 604.7887257187.

Adding to 221213211 its reverse (112312122), we get a palindrome (333525333).

The spelling of 221213211 in words is "two hundred twenty-one million, two hundred thirteen thousand, two hundred eleven".