21763198791 has 24 divisors (see below), whose sum is σ = 32029121280. Its totient is φ = 14237183376.

The previous prime is 21763198777. The next prime is 21763198819. The reversal of 21763198791 is 19789136712.

It is a happy number.

It is not a de Polignac number, because 21763198791 - 2⁹ = 21763198279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21763198711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22000 + ... + 209786.

It is an arithmetic number, because the mean of its divisors is an integer number (1334546720).

Almost surely, 2^21763198791 is an apocalyptic number.

21763198791 is a deficient number, since it is larger than the sum of its proper divisors (10265922489).

21763198791 is a wasteful number, since it uses less digits than its factorization.

21763198791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188035 (or 188032 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The spelling of 21763198791 in words is "twenty-one billion, seven hundred sixty-three million, one hundred ninety-eight thousand, seven hundred ninety-one".