21793505143 has 4 divisors (see below), whose sum is σ = 22300330888. Its totient is φ = 21286679400.

The previous prime is 21793505119. The next prime is 21793505189. The reversal of 21793505143 is 34150539712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21793505143 - 2⁹ = 21793504631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21793505096 and 21793505105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21793505543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253412808 + ... + 253412893.

It is an arithmetic number, because the mean of its divisors is an integer number (5575082722).

Almost surely, 2^21793505143 is an apocalyptic number.

21793505143 is a deficient number, since it is larger than the sum of its proper divisors (506825745).

21793505143 is an equidigital number, since it uses as much as digits as its factorization.

21793505143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506825744.

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 21793505143 in words is "twenty-one billion, seven hundred ninety-three million, five hundred five thousand, one hundred forty-three".