21794854223 has 4 divisors (see below), whose sum is σ = 21961227288. Its totient is φ = 21628481160.

The previous prime is 21794854157. The next prime is 21794854259. The reversal of 21794854223 is 32245849712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21794854223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794844223) 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, 83186336 + ... + 83186597.

It is an arithmetic number, because the mean of its divisors is an integer number (5490306822).

Almost surely, 2^21794854223 is an apocalyptic number.

21794854223 is a deficient number, since it is larger than the sum of its proper divisors (166373065).

21794854223 is a wasteful number, since it uses less digits than its factorization.

21794854223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166373064.

The product of its digits is 967680, while the sum is 47.

The spelling of 21794854223 in words is "twenty-one billion, seven hundred ninety-four million, eight hundred fifty-four thousand, two hundred twenty-three".