21942109443 has 8 divisors (see below), whose sum is σ = 29419588800. Its totient is φ = 14546351528.

The previous prime is 21942109391. The next prime is 21942109447. The reversal of 21942109443 is 34490124912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21942109443 - 2⁹ = 21942108931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21942109447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20429733 + ... + 20430806.

It is an arithmetic number, because the mean of its divisors is an integer number (3677448600).

Almost surely, 2^21942109443 is an apocalyptic number.

21942109443 is a deficient number, since it is larger than the sum of its proper divisors (7477479357).

21942109443 is a wasteful number, since it uses less digits than its factorization.

21942109443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40860721.

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 21942109443 in words is "twenty-one billion, nine hundred forty-two million, one hundred nine thousand, four hundred forty-three".