2121222221213 has 2 divisors, whose sum is σ = 2121222221214. Its totient is φ = 2121222221212.

The previous prime is 2121222221201. The next prime is 2121222221263. The reversal of 2121222221213 is 3121222221212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1526801267044 + 594420954169 = 1235638^2 + 770987^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121222221213 - 2⁴ = 2121222221197 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 (2121222221263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611110606 + 1060611110607.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611110607).

Almost surely, 2^{2121222221213} is an apocalyptic number.

It is an amenable number.

2121222221213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222221213 is an equidigital number, since it uses as much as digits as its factorization.

2121222221213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

Adding to 2121222221213 its reverse (3121222221212), we get a palindrome (5242444442425).

Subtracting 2121222221213 from its reverse (3121222221212), we obtain a palindrome (999999999999).

The spelling of 2121222221213 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred thirteen".