21868135363 has 2 divisors, whose sum is σ = 21868135364. Its totient is φ = 21868135362.

The previous prime is 21868135337. The next prime is 21868135409. The reversal of 21868135363 is 36353186812.

It is an a-pointer prime, because the next prime (21868135409) can be obtained adding 21868135363 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21868135363 - 2⁹ = 21868134851 is a prime.

It is a super-2 number, since 2×21868135363² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21868135313) 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, 10934067681 + 10934067682.

It is an arithmetic number, because the mean of its divisors is an integer number (10934067682).

Almost surely, 2^21868135363 is an apocalyptic number.

21868135363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21868135363 is an equidigital number, since it uses as much as digits as its factorization.

21868135363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The spelling of 21868135363 in words is "twenty-one billion, eight hundred sixty-eight million, one hundred thirty-five thousand, three hundred sixty-three".