21165034443 has 32 divisors (see below), whose sum is σ = 32448230400. Its totient is φ = 12020659200.

The previous prime is 21165034433. The next prime is 21165034453. The reversal of 21165034443 is 34443056112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21165034433) and next prime (21165034453).

It is not a de Polignac number, because 21165034443 - 2¹³ = 21165026251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21165034433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5016871 + ... + 5021087.

It is an arithmetic number, because the mean of its divisors is an integer number (1014007200).

Almost surely, 2^21165034443 is an apocalyptic number.

21165034443 is a deficient number, since it is larger than the sum of its proper divisors (11283195957).

21165034443 is a wasteful number, since it uses less digits than its factorization.

21165034443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5627.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 21165034443 in words is "twenty-one billion, one hundred sixty-five million, thirty-four thousand, four hundred forty-three".