213365221 has 4 divisors (see below), whose sum is σ = 215436832. Its totient is φ = 211293612.

The previous prime is 213365171. The next prime is 213365233. The reversal of 213365221 is 122563312.

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 213365221 - 2²³ = 204976613 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 (213365261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035651 + ... + 1035856.

It is an arithmetic number, because the mean of its divisors is an integer number (53859208).

Almost surely, 2^213365221 is an apocalyptic number.

It is an amenable number.

213365221 is a deficient number, since it is larger than the sum of its proper divisors (2071611).

213365221 is a wasteful number, since it uses less digits than its factorization.

213365221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071610.

The product of its digits is 2160, while the sum is 25.

The square root of 213365221 is about 14607.0264256624. The cubic root of 213365221 is about 597.5504025454.

The spelling of 213365221 in words is "two hundred thirteen million, three hundred sixty-five thousand, two hundred twenty-one".