21655416002267 has 2 divisors, whose sum is σ = 21655416002268. Its totient is φ = 21655416002266.

The previous prime is 21655416002257. The next prime is 21655416002281. The reversal of 21655416002267 is 76220061455612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21655416002267 - 2⁴⁰ = 20555904374491 is a prime.

It is a super-2 number, since 2×21655416002267² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21655416002237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827708001133 + 10827708001134.

It is an arithmetic number, because the mean of its divisors is an integer number (10827708001134).

Almost surely, 2^{21655416002267} is an apocalyptic number.

21655416002267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21655416002267 is an equidigital number, since it uses as much as digits as its factorization.

21655416002267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 47.

Adding to 21655416002267 its reverse (76220061455612), we get a palindrome (97875477457879).

The spelling of 21655416002267 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred sixteen million, two thousand, two hundred sixty-seven".