21763751519 has 2 divisors, whose sum is σ = 21763751520. Its totient is φ = 21763751518.

The previous prime is 21763751507. The next prime is 21763751561. The reversal of 21763751519 is 91515736712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21763751519 - 2⁸ = 21763751263 is a prime.

It is a super-2 number, since 2×21763751519² (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 (21763751579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881875759 + 10881875760.

It is an arithmetic number, because the mean of its divisors is an integer number (10881875760).

Almost surely, 2^21763751519 is an apocalyptic number.

21763751519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21763751519 is an equidigital number, since it uses as much as digits as its factorization.

21763751519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 47.

The spelling of 21763751519 in words is "twenty-one billion, seven hundred sixty-three million, seven hundred fifty-one thousand, five hundred nineteen".