21763800771 has 16 divisors (see below), whose sum is σ = 29416296960. Its totient is φ = 14310635040.

The previous prime is 21763800763. The next prime is 21763800797. The reversal of 21763800771 is 17700836712.

It is a happy number.

It is not a de Polignac number, because 21763800771 - 2³ = 21763800763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21763800731) 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 in 15 ways as a sum of consecutive naturals, for example, 182841 + ... + 277413.

It is an arithmetic number, because the mean of its divisors is an integer number (1838518560).

Almost surely, 2^21763800771 is an apocalyptic number.

21763800771 is a deficient number, since it is larger than the sum of its proper divisors (7652496189).

21763800771 is an equidigital number, since it uses as much as digits as its factorization.

21763800771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95626.

The product of its (nonzero) digits is 98784, while the sum is 42.

The spelling of 21763800771 in words is "twenty-one billion, seven hundred sixty-three million, eight hundred thousand, seven hundred seventy-one".