21804111874 has 4 divisors (see below), whose sum is σ = 32706167814. Its totient is φ = 10902055936.

The previous prime is 21804111871. The next prime is 21804111907. The reversal of 21804111874 is 47811140812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17631856225 + 4172255649 = 132785^2 + 64593^2 .

It is a super-3 number, since 3×21804111874³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21804111871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5451027967 + ... + 5451027970.

Almost surely, 2^21804111874 is an apocalyptic number.

21804111874 is a deficient number, since it is larger than the sum of its proper divisors (10902055940).

21804111874 is a wasteful number, since it uses less digits than its factorization.

21804111874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10902055939.

The product of its (nonzero) digits is 14336, while the sum is 37.

The spelling of 21804111874 in words is "twenty-one billion, eight hundred four million, one hundred eleven thousand, eight hundred seventy-four".