21751331163 has 8 divisors (see below), whose sum is σ = 29002886976. Its totient is φ = 14500331400.

The previous prime is 21751331159. The next prime is 21751331177. The reversal of 21751331163 is 36113315712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21751331163 - 2² = 21751331159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21751331663) 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 in 7 ways as a sum of consecutive naturals, for example, 37053 + ... + 211838.

It is an arithmetic number, because the mean of its divisors is an integer number (3625360872).

Almost surely, 2^21751331163 is an apocalyptic number.

21751331163 is a deficient number, since it is larger than the sum of its proper divisors (7251555813).

21751331163 is a wasteful number, since it uses less digits than its factorization.

21751331163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278025.

The product of its digits is 11340, while the sum is 33.

Adding to 21751331163 its reverse (36113315712), we get a palindrome (57864646875).

The spelling of 21751331163 in words is "twenty-one billion, seven hundred fifty-one million, three hundred thirty-one thousand, one hundred sixty-three".