22121213 has 2 divisors, whose sum is σ = 22121214. Its totient is φ = 22121212.

The previous prime is 22121201. The next prime is 22121293. The reversal of 22121213 is 31212122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 573049 = 4642^2 + 757^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121213 - 2⁸ = 22120957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060606 + 11060607.

It is an arithmetic number, because the mean of its divisors is an integer number (11060607).

Almost surely, 2^22121213 is an apocalyptic number.

It is an amenable number.

22121213 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121213 is an equidigital number, since it uses as much as digits as its factorization.

22121213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 14.

The square root of 22121213 is about 4703.3193597714. The cubic root of 22121213 is about 280.7176023378.

Adding to 22121213 its reverse (31212122), we get a palindrome (53333335).

Subtracting 22121213 from its reverse (31212122), we obtain a palindrome (9090909).

The spelling of 22121213 in words is "twenty-two million, one hundred twenty-one thousand, two hundred thirteen".