22111213 has 4 divisors (see below), whose sum is σ = 22141180. Its totient is φ = 22081248.

The previous prime is 22111207. The next prime is 22111241. The reversal of 22111213 is 31211122.

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 11437924 + 10673289 = 3382^2 + 3267^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111213 - 2⁵ = 22111181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22111193 and 22111202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111513) 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, 13848 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (5535295).

Almost surely, 2^22111213 is an apocalyptic number.

It is an amenable number.

22111213 is a deficient number, since it is larger than the sum of its proper divisors (29967).

22111213 is an equidigital number, since it uses as much as digits as its factorization.

22111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29966.

The product of its digits is 24, while the sum is 13.

The square root of 22111213 is about 4702.2561606106. The cubic root of 22111213 is about 280.6752960512.

Adding to 22111213 its reverse (31211122), we get a palindrome (53322335).

Subtracting 22111213 from its reverse (31211122), we obtain a palindrome (9099909).

The spelling of 22111213 in words is "twenty-two million, one hundred eleven thousand, two hundred thirteen".