21611173554472 has 16 divisors (see below), whose sum is σ = 40551671397600. Its totient is φ = 10797394515120.

The previous prime is 21611173554437. The next prime is 21611173554613. The reversal of 21611173554472 is 27445537111612.

21611173554472 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 1024021554 + ... + 1024042657.

It is an arithmetic number, because the mean of its divisors is an integer number (2534479462350).

Almost surely, 2^{21611173554472} is an apocalyptic number.

It is an amenable number.

21611173554472 is a deficient number, since it is larger than the sum of its proper divisors (18940497843128).

21611173554472 is a wasteful number, since it uses less digits than its factorization.

21611173554472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048065536 (or 2048065532 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 49.

The spelling of 21611173554472 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy-three million, five hundred fifty-four thousand, four hundred seventy-two".