21342213 has 12 divisors (see below), whose sum is σ = 30869280. Its totient is φ = 14208936.

The previous prime is 21342203. The next prime is 21342221. The reversal of 21342213 is 31224312.

It is not a de Polignac number, because 21342213 - 2¹⁶ = 21276677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9448 + ... + 11486.

It is an arithmetic number, because the mean of its divisors is an integer number (2572440).

Almost surely, 2^21342213 is an apocalyptic number.

It is an amenable number.

21342213 is a deficient number, since it is larger than the sum of its proper divisors (9527067).

21342213 is a wasteful number, since it uses less digits than its factorization.

21342213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208 (or 3205 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 21342213 is about 4619.7633056251. The cubic root of 21342213 is about 277.3829845088.

Adding to 21342213 its reverse (31224312), we get a palindrome (52566525).

The spelling of 21342213 in words is "twenty-one million, three hundred forty-two thousand, two hundred thirteen".