21904473165903 has 12 divisors (see below), whose sum is σ = 31640409571680. Its totient is φ = 14602698265056.

The previous prime is 21904473165901. The next prime is 21904473165917. The reversal of 21904473165903 is 30956137440912.

21904473165903 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 4 + 47 + 3 + 1 + 6 + 590 + 3 = 666.

It is not a de Polignac number, because 21904473165903 - 2¹ = 21904473165901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21904473165903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21904473165901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23164518 + ... + 24091571.

It is an arithmetic number, because the mean of its divisors is an integer number (2636700797640).

Almost surely, 2^{21904473165903} is an apocalyptic number.

21904473165903 is a deficient number, since it is larger than the sum of its proper divisors (9735936405777).

21904473165903 is a wasteful number, since it uses less digits than its factorization.

21904473165903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47307598 (or 47307595 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 21904473165903 in words is "twenty-one trillion, nine hundred four billion, four hundred seventy-three million, one hundred sixty-five thousand, nine hundred three".