213521223 has 8 divisors (see below), whose sum is σ = 286868736. Its totient is φ = 141260600.

The previous prime is 213521201. The next prime is 213521249. The reversal of 213521223 is 322125312.

213521223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 213521223 - 2²⁵ = 179966791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213521223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213521123) 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, 271263 + ... + 272048.

It is an arithmetic number, because the mean of its divisors is an integer number (35858592).

Almost surely, 2^213521223 is an apocalyptic number.

213521223 is a deficient number, since it is larger than the sum of its proper divisors (73347513).

213521223 is a wasteful number, since it uses less digits than its factorization.

213521223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543445.

The product of its digits is 720, while the sum is 21.

The square root of 213521223 is about 14612.3654142647. The cubic root of 213521223 is about 597.6960000763.

Adding to 213521223 its reverse (322125312), we get a palindrome (535646535).

The spelling of 213521223 in words is "two hundred thirteen million, five hundred twenty-one thousand, two hundred twenty-three".