21794488571 has 4 divisors (see below), whose sum is σ = 21830394432. Its totient is φ = 21758582712.

The previous prime is 21794488561. The next prime is 21794488577. The reversal of 21794488571 is 17588449712.

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-21794488571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21794488577) 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, 17952020 + ... + 17953233.

It is an arithmetic number, because the mean of its divisors is an integer number (5457598608).

Almost surely, 2^21794488571 is an apocalyptic number.

21794488571 is a deficient number, since it is larger than the sum of its proper divisors (35905861).

21794488571 is an equidigital number, since it uses as much as digits as its factorization.

21794488571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35905860.

The product of its digits is 4515840, while the sum is 56.

The spelling of 21794488571 in words is "twenty-one billion, seven hundred ninety-four million, four hundred eighty-eight thousand, five hundred seventy-one".