213022221 has 4 divisors (see below), whose sum is σ = 284029632. Its totient is φ = 142014812.

The previous prime is 213022219. The next prime is 213022253. The reversal of 213022221 is 122220312.

It is a happy number.

213022221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213022221 - 2¹ = 213022219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213022321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35503701 + ... + 35503706.

It is an arithmetic number, because the mean of its divisors is an integer number (71007408).

Almost surely, 2^213022221 is an apocalyptic number.

It is an amenable number.

213022221 is a deficient number, since it is larger than the sum of its proper divisors (71007411).

213022221 is an equidigital number, since it uses as much as digits as its factorization.

213022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71007410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 213022221 is about 14595.2807783886. The cubic root of 213022221 is about 597.2300290023.

Adding to 213022221 its reverse (122220312), we get a palindrome (335242533).

The spelling of 213022221 in words is "two hundred thirteen million, twenty-two thousand, two hundred twenty-one".