21423175793 has 4 divisors (see below), whose sum is σ = 21559629300. Its totient is φ = 21286722288.

The previous prime is 21423175789. The next prime is 21423175799. The reversal of 21423175793 is 39757132412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2055443569 + 19367732224 = 45337^2 + 139168^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423175793 - 2² = 21423175789 is a prime.

It is a super-2 number, since 2×21423175793² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423175799) 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, 68226518 + ... + 68226831.

It is an arithmetic number, because the mean of its divisors is an integer number (5389907325).

Almost surely, 2^21423175793 is an apocalyptic number.

It is an amenable number.

21423175793 is a deficient number, since it is larger than the sum of its proper divisors (136453507).

21423175793 is a wasteful number, since it uses less digits than its factorization.

21423175793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136453506.

The product of its digits is 317520, while the sum is 44.

The spelling of 21423175793 in words is "twenty-one billion, four hundred twenty-three million, one hundred seventy-five thousand, seven hundred ninety-three".