22211221213 has 4 divisors (see below), whose sum is σ = 22232156508. Its totient is φ = 22190285920.

The previous prime is 22211221211. The next prime is 22211221229. The reversal of 22211221213 is 31212211222.

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 19679320089 + 2531901124 = 140283^2 + 50318^2 .

It is a cyclic number.

It is not a de Polignac number, because 22211221213 - 2¹ = 22211221211 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 (22211221211) 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, 10466056 + ... + 10468177.

It is an arithmetic number, because the mean of its divisors is an integer number (5558039127).

Almost surely, 2^22211221213 is an apocalyptic number.

It is an amenable number.

22211221213 is a deficient number, since it is larger than the sum of its proper divisors (20935295).

22211221213 is a wasteful number, since it uses less digits than its factorization.

22211221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20935294.

The product of its digits is 192, while the sum is 19.

Adding to 22211221213 its reverse (31212211222), we get a palindrome (53423432435).

Subtracting 22211221213 from its reverse (31212211222), we obtain a palindrome (9000990009).

The spelling of 22211221213 in words is "twenty-two billion, two hundred eleven million, two hundred twenty-one thousand, two hundred thirteen".