21230222213 has 4 divisors (see below), whose sum is σ = 21242474508. Its totient is φ = 21217969920.

The previous prime is 21230222191. The next prime is 21230222269. The reversal of 21230222213 is 31222203212.

It is a happy number.

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 13241795329 + 7988426884 = 115073^2 + 89378^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230222213 - 2¹⁰ = 21230221189 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 (21230221213) 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, 6123548 + ... + 6127013.

It is an arithmetic number, because the mean of its divisors is an integer number (5310618627).

Almost surely, 2^21230222213 is an apocalyptic number.

It is an amenable number.

21230222213 is a deficient number, since it is larger than the sum of its proper divisors (12252295).

21230222213 is a wasteful number, since it uses less digits than its factorization.

21230222213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12252294.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21230222213 its reverse (31222203212), we get a palindrome (52452425425).

The spelling of 21230222213 in words is "twenty-one billion, two hundred thirty million, two hundred twenty-two thousand, two hundred thirteen".