21073165443 has 32 divisors (see below), whose sum is σ = 34070745600. Its totient is φ = 12766701600.

The previous prime is 21073165441. The next prime is 21073165453. The reversal of 21073165443 is 34456137012.

21073165443 is a `hidden beast` number, since 2 + 107 + 3 + 1 + 6 + 544 + 3 = 666.

It is not a de Polignac number, because 21073165443 - 2¹ = 21073165441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21073165398 and 21073165407.

It is not an unprimeable number, because it can be changed into a prime (21073165441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 851778 + ... + 876168.

It is an arithmetic number, because the mean of its divisors is an integer number (1064710800).

Almost surely, 2^21073165443 is an apocalyptic number.

21073165443 is a deficient number, since it is larger than the sum of its proper divisors (12997580157).

21073165443 is a wasteful number, since it uses less digits than its factorization.

21073165443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27320 (or 27314 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 21073165443 in words is "twenty-one billion, seventy-three million, one hundred sixty-five thousand, four hundred forty-three".