21942618337 has 2 divisors, whose sum is σ = 21942618338. Its totient is φ = 21942618336.

The previous prime is 21942618311. The next prime is 21942618371. The reversal of 21942618337 is 73381624912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13763043856 + 8179574481 = 117316^2 + 90441^2 .

It is a cyclic number.

It is not a de Polignac number, because 21942618337 - 2⁷ = 21942618209 is a prime.

It is not a weakly prime, because it can be changed into another prime (21942612337) 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, 10971309168 + 10971309169.

It is an arithmetic number, because the mean of its divisors is an integer number (10971309169).

Almost surely, 2^21942618337 is an apocalyptic number.

It is an amenable number.

21942618337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21942618337 is an equidigital number, since it uses as much as digits as its factorization.

21942618337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 46.

The spelling of 21942618337 in words is "twenty-one billion, nine hundred forty-two million, six hundred eighteen thousand, three hundred thirty-seven".