21126440903 has 2 divisors, whose sum is σ = 21126440904. Its totient is φ = 21126440902.

The previous prime is 21126440899. The next prime is 21126440963. The reversal of 21126440903 is 30904462112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21126440903 - 2² = 21126440899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21126440903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21126440963) 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, 10563220451 + 10563220452.

It is an arithmetic number, because the mean of its divisors is an integer number (10563220452).

Almost surely, 2^21126440903 is an apocalyptic number.

21126440903 is a deficient number, since it is larger than the sum of its proper divisors (1).

21126440903 is an equidigital number, since it uses as much as digits as its factorization.

21126440903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21126440903 in words is "twenty-one billion, one hundred twenty-six million, four hundred forty thousand, nine hundred three".