21203633519 has 2 divisors, whose sum is σ = 21203633520. Its totient is φ = 21203633518.

The previous prime is 21203633491. The next prime is 21203633531. The reversal of 21203633519 is 91533630212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203633519 is a prime.

It is a super-2 number, since 2×21203633519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203633569) 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, 10601816759 + 10601816760.

It is an arithmetic number, because the mean of its divisors is an integer number (10601816760).

Almost surely, 2^21203633519 is an apocalyptic number.

21203633519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203633519 is an equidigital number, since it uses as much as digits as its factorization.

21203633519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 21203633519 in words is "twenty-one billion, two hundred three million, six hundred thirty-three thousand, five hundred nineteen".