21133665443 has 16 divisors (see below), whose sum is σ = 23151737952. Its totient is φ = 19131840000.

The previous prime is 21133665409. The next prime is 21133665457. The reversal of 21133665443 is 34456633112.

It is a cyclic number.

It is not a de Polignac number, because 21133665443 - 2⁸ = 21133665187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21133665397 and 21133665406.

It is not an unprimeable number, because it can be changed into a prime (21133665403) 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 15 ways as a sum of consecutive naturals, for example, 7543643 + ... + 7546443.

It is an arithmetic number, because the mean of its divisors is an integer number (1446983622).

Almost surely, 2^21133665443 is an apocalyptic number.

21133665443 is a deficient number, since it is larger than the sum of its proper divisors (2018072509).

21133665443 is a wasteful number, since it uses less digits than its factorization.

21133665443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5446.

The product of its digits is 155520, while the sum is 38.

The spelling of 21133665443 in words is "twenty-one billion, one hundred thirty-three million, six hundred sixty-five thousand, four hundred forty-three".