21311161174 has 32 divisors (see below), whose sum is σ = 32559770880. Its totient is φ = 10459821600.

The previous prime is 21311161147. The next prime is 21311161199. The reversal of 21311161174 is 47116111312.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26277229 + ... + 26278039.

It is an arithmetic number, because the mean of its divisors is an integer number (1017492840).

Almost surely, 2^21311161174 is an apocalyptic number.

21311161174 is a deficient number, since it is larger than the sum of its proper divisors (11248609706).

21311161174 is a wasteful number, since it uses less digits than its factorization.

21311161174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 1008, while the sum is 28.

Adding to 21311161174 its reverse (47116111312), we get a palindrome (68427272486).

The spelling of 21311161174 in words is "twenty-one billion, three hundred eleven million, one hundred sixty-one thousand, one hundred seventy-four".