21794399713 has 4 divisors (see below), whose sum is σ = 21794959620. Its totient is φ = 21793839808.

The previous prime is 21794399699. The next prime is 21794399719. The reversal of 21794399713 is 31799349712.

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 20485624384 + 1308775329 = 143128^2 + 36177^2 .

It is a cyclic number.

It is not a de Polignac number, because 21794399713 - 2²⁹ = 21257528801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21794399719) 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, 216820 + ... + 300997.

It is an arithmetic number, because the mean of its divisors is an integer number (5448739905).

Almost surely, 2^21794399713 is an apocalyptic number.

It is an amenable number.

21794399713 is a deficient number, since it is larger than the sum of its proper divisors (559907).

21794399713 is an equidigital number, since it uses as much as digits as its factorization.

21794399713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559906.

The product of its digits is 2571912, while the sum is 55.

The spelling of 21794399713 in words is "twenty-one billion, seven hundred ninety-four million, three hundred ninety-nine thousand, seven hundred thirteen".