22121311213 has 2 divisors, whose sum is σ = 22121311214. Its totient is φ = 22121311212.

The previous prime is 22121311207. The next prime is 22121311301. The reversal of 22121311213 is 31211312122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16728318244 + 5392992969 = 129338^2 + 73437^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121311213 - 2¹³ = 22121303021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121311313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060655606 + 11060655607.

It is an arithmetic number, because the mean of its divisors is an integer number (11060655607).

Almost surely, 2^22121311213 is an apocalyptic number.

It is an amenable number.

22121311213 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121311213 is an equidigital number, since it uses as much as digits as its factorization.

22121311213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 22121311213 its reverse (31211312122), we get a palindrome (53332623335).

Subtracting 22121311213 from its reverse (31211312122), we obtain a palindrome (9090000909).

The spelling of 22121311213 in words is "twenty-two billion, one hundred twenty-one million, three hundred eleven thousand, two hundred thirteen".