21251281183 has 6 divisors (see below), whose sum is σ = 23358846392. Its totient is φ = 19319346420.

The previous prime is 21251281159. The next prime is 21251281211. The reversal of 21251281183 is 38118215212.

It is not a de Polignac number, because 21251281183 - 2⁵ = 21251281151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251281123) 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 5 ways as a sum of consecutive naturals, for example, 87815091 + ... + 87815332.

Almost surely, 2^21251281183 is an apocalyptic number.

21251281183 is a deficient number, since it is larger than the sum of its proper divisors (2107565209).

21251281183 is a wasteful number, since it uses less digits than its factorization.

21251281183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175630445 (or 175630434 counting only the distinct ones).

The product of its digits is 7680, while the sum is 34.

Adding to 21251281183 its reverse (38118215212), we get a palindrome (59369496395).

The spelling of 21251281183 in words is "twenty-one billion, two hundred fifty-one million, two hundred eighty-one thousand, one hundred eighty-three".