21763284731 has 2 divisors, whose sum is σ = 21763284732. Its totient is φ = 21763284730.

The previous prime is 21763284679. The next prime is 21763284839. The reversal of 21763284731 is 13748236712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21763284731 - 2¹⁸ = 21763022587 is a prime.

It is a super-2 number, since 2×21763284731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21763286731) 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, 10881642365 + 10881642366.

It is an arithmetic number, because the mean of its divisors is an integer number (10881642366).

Almost surely, 2^21763284731 is an apocalyptic number.

21763284731 is a deficient number, since it is larger than the sum of its proper divisors (1).

21763284731 is an equidigital number, since it uses as much as digits as its factorization.

21763284731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 44.

The spelling of 21763284731 in words is "twenty-one billion, seven hundred sixty-three million, two hundred eighty-four thousand, seven hundred thirty-one".