21758605535423 has 2 divisors, whose sum is σ = 21758605535424. Its totient is φ = 21758605535422.

The previous prime is 21758605535357. The next prime is 21758605535453. The reversal of 21758605535423 is 32453550685712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21758605535423 is a prime.

It is a super-2 number, since 2×21758605535423² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21758605535453) 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, 10879302767711 + 10879302767712.

It is an arithmetic number, because the mean of its divisors is an integer number (10879302767712).

Almost surely, 2^{21758605535423} is an apocalyptic number.

21758605535423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21758605535423 is an equidigital number, since it uses as much as digits as its factorization.

21758605535423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240000, while the sum is 56.

The spelling of 21758605535423 in words is "twenty-one trillion, seven hundred fifty-eight billion, six hundred five million, five hundred thirty-five thousand, four hundred twenty-three".