21626343256603 has 2 divisors, whose sum is σ = 21626343256604. Its totient is φ = 21626343256602.

The previous prime is 21626343256571. The next prime is 21626343256657. The reversal of 21626343256603 is 30665234362612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21626343256603 - 2⁵ = 21626343256571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21626343356603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10813171628301 + 10813171628302.

It is an arithmetic number, because the mean of its divisors is an integer number (10813171628302).

Almost surely, 2^{21626343256603} is an apocalyptic number.

21626343256603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21626343256603 is an equidigital number, since it uses as much as digits as its factorization.

21626343256603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 49.

The spelling of 21626343256603 in words is "twenty-one trillion, six hundred twenty-six billion, three hundred forty-three million, two hundred fifty-six thousand, six hundred three".