22191821357 has 2 divisors, whose sum is σ = 22191821358. Its totient is φ = 22191821356.

The previous prime is 22191821347. The next prime is 22191821363. The reversal of 22191821357 is 75312819122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17818512196 + 4373309161 = 133486^2 + 66131^2 .

It is a cyclic number.

It is not a de Polignac number, because 22191821357 - 2¹⁸ = 22191559213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22191821347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11095910678 + 11095910679.

It is an arithmetic number, because the mean of its divisors is an integer number (11095910679).

Almost surely, 2^22191821357 is an apocalyptic number.

It is an amenable number.

22191821357 is a deficient number, since it is larger than the sum of its proper divisors (1).

22191821357 is an equidigital number, since it uses as much as digits as its factorization.

22191821357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The spelling of 22191821357 in words is "twenty-two billion, one hundred ninety-one million, eight hundred twenty-one thousand, three hundred fifty-seven".