21052666657443 has 8 divisors (see below), whose sum is σ = 28256117721856. Its totient is φ = 13942163349000.

The previous prime is 21052666657441. The next prime is 21052666657471. The reversal of 21052666657443 is 34475666625012.

It is a happy number.

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

It is not a de Polignac number, because 21052666657443 - 2¹ = 21052666657441 is a prime.

It is the 4588319-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052666657441) by changing a digit.

It is a nontrivial repunit in base 4588318.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23236938463 + ... + 23236939368.

It is an arithmetic number, because the mean of its divisors is an integer number (3532014715232).

Almost surely, 2^{21052666657443} is an apocalyptic number.

21052666657443 is a deficient number, since it is larger than the sum of its proper divisors (7203451064413).

21052666657443 is a wasteful number, since it uses less digits than its factorization.

21052666657443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46473877985.

The product of its (nonzero) digits is 43545600, while the sum is 57.

The spelling of 21052666657443 in words is "twenty-one trillion, fifty-two billion, six hundred sixty-six million, six hundred fifty-seven thousand, four hundred forty-three".