21213403636603 has 2 divisors, whose sum is σ = 21213403636604. Its totient is φ = 21213403636602.

The previous prime is 21213403636591. The next prime is 21213403636669. The reversal of 21213403636603 is 30663630431212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213403636603 - 2⁹ = 21213403636091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213403136603) 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, 10606701818301 + 10606701818302.

It is an arithmetic number, because the mean of its divisors is an integer number (10606701818302).

Almost surely, 2^{21213403636603} is an apocalyptic number.

21213403636603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213403636603 is an equidigital number, since it uses as much as digits as its factorization.

21213403636603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 40.

The spelling of 21213403636603 in words is "twenty-one trillion, two hundred thirteen billion, four hundred three million, six hundred thirty-six thousand, six hundred three".