213121223 has 8 divisors (see below), whose sum is σ = 246650880. Its totient is φ = 180362520.

The previous prime is 213121219. The next prime is 213121229. The reversal of 213121223 is 322121312.

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 213121223 - 2² = 213121219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121229) 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 7 ways as a sum of consecutive naturals, for example, 192143 + ... + 193248.

It is an arithmetic number, because the mean of its divisors is an integer number (30831360).

Almost surely, 2^213121223 is an apocalyptic number.

213121223 is a deficient number, since it is larger than the sum of its proper divisors (33529657).

213121223 is an equidigital number, since it uses as much as digits as its factorization.

213121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385477.

The product of its digits is 144, while the sum is 17.

The square root of 213121223 is about 14598.6719601476. The cubic root of 213121223 is about 597.3225354862.

Adding to 213121223 its reverse (322121312), we get a palindrome (535242535).

The spelling of 213121223 in words is "two hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-three".