21019019603 has 2 divisors, whose sum is σ = 21019019604. Its totient is φ = 21019019602.

The previous prime is 21019019573. The next prime is 21019019633. The reversal of 21019019603 is 30691091012.

It is a balanced prime because it is at equal distance from previous prime (21019019573) and next prime (21019019633).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21019019603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21019019603.

It is not a weakly prime, because it can be changed into another prime (21019019633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509509801 + 10509509802.

It is an arithmetic number, because the mean of its divisors is an integer number (10509509802).

Almost surely, 2^21019019603 is an apocalyptic number.

21019019603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019019603 is an equidigital number, since it uses as much as digits as its factorization.

21019019603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 21019019603 in words is "twenty-one billion, nineteen million, nineteen thousand, six hundred three".