21763751573 has 2 divisors, whose sum is σ = 21763751574. Its totient is φ = 21763751572.

The previous prime is 21763751561. The next prime is 21763751579. The reversal of 21763751573 is 37515736712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12620949649 + 9142801924 = 112343^2 + 95618^2 .

It is a cyclic number.

It is not a de Polignac number, because 21763751573 - 2¹⁰ = 21763750549 is a prime.

It is a super-3 number, since 3×21763751573³ (a number of 32 digits) contains 333 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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881875786 + 10881875787.

It is an arithmetic number, because the mean of its divisors is an integer number (10881875787).

Almost surely, 2^21763751573 is an apocalyptic number.

It is an amenable number.

21763751573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21763751573 is an equidigital number, since it uses as much as digits as its factorization.

21763751573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 926100, while the sum is 47.

The spelling of 21763751573 in words is "twenty-one billion, seven hundred sixty-three million, seven hundred fifty-one thousand, five hundred seventy-three".