21868135337 has 2 divisors, whose sum is σ = 21868135338. Its totient is φ = 21868135336.

The previous prime is 21868135321. The next prime is 21868135363. The reversal of 21868135337 is 73353186812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21777200041 + 90935296 = 147571^2 + 9536^2 .

It is a cyclic number.

It is not a de Polignac number, because 21868135337 - 2⁴ = 21868135321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21868135291 and 21868135300.

It is not a weakly prime, because it can be changed into another prime (21868135837) 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, 10934067668 + 10934067669.

It is an arithmetic number, because the mean of its divisors is an integer number (10934067669).

Almost surely, 2^21868135337 is an apocalyptic number.

It is an amenable number.

21868135337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21868135337 is an equidigital number, since it uses as much as digits as its factorization.

21868135337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The spelling of 21868135337 in words is "twenty-one billion, eight hundred sixty-eight million, one hundred thirty-five thousand, three hundred thirty-seven".