21223330213 has 4 divisors (see below), whose sum is σ = 22471761420. Its totient is φ = 19974899008.

The previous prime is 21223330211. The next prime is 21223330253. The reversal of 21223330213 is 31203332212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14639306049 + 6584024164 = 120993^2 + 81142^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223330213 - 2¹ = 21223330211 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 (21223330211) 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, 624215578 + ... + 624215611.

It is an arithmetic number, because the mean of its divisors is an integer number (5617940355).

Almost surely, 2^21223330213 is an apocalyptic number.

It is an amenable number.

21223330213 is a deficient number, since it is larger than the sum of its proper divisors (1248431207).

21223330213 is a wasteful number, since it uses less digits than its factorization.

21223330213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248431206.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21223330213 its reverse (31203332212), we get a palindrome (52426662425).

The spelling of 21223330213 in words is "twenty-one billion, two hundred twenty-three million, three hundred thirty thousand, two hundred thirteen".