21104004232143 has 36 divisors (see below), whose sum is σ = 36081103828848. Its totient is φ = 11643588512640.

The previous prime is 21104004232123. The next prime is 21104004232151. The reversal of 21104004232143 is 34123240040112.

21104004232143 is a `hidden beast` number, since 2 + 1 + 1 + 0 + 400 + 42 + 3 + 214 + 3 = 666.

It is not a de Polignac number, because 21104004232143 - 2⁶ = 21104004232079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104004232123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 199105278 + ... + 199211243.

Almost surely, 2^{21104004232143} is an apocalyptic number.

21104004232143 is a deficient number, since it is larger than the sum of its proper divisors (14977099596705).

21104004232143 is a wasteful number, since it uses less digits than its factorization.

21104004232143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398316592 (or 398316560 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21104004232143 its reverse (34123240040112), we get a palindrome (55227244272255).

The spelling of 21104004232143 in words is "twenty-one trillion, one hundred four billion, four million, two hundred thirty-two thousand, one hundred forty-three".