21311176124 has 12 divisors (see below), whose sum is σ = 42622352304. Its totient is φ = 9133361184.

The previous prime is 21311176109. The next prime is 21311176129. The reversal of 21311176124 is 42167111312.

21311176124 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311176129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380556689 + ... + 380556744.

It is an arithmetic number, because the mean of its divisors is an integer number (3551862692).

Almost surely, 2^21311176124 is an apocalyptic number.

It is an amenable number.

21311176124 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311176124 is a wasteful number, since it uses less digits than its factorization.

21311176124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761113444 (or 761113442 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

Adding to 21311176124 its reverse (42167111312), we get a palindrome (63478287436).

The spelling of 21311176124 in words is "twenty-one billion, three hundred eleven million, one hundred seventy-six thousand, one hundred twenty-four".