21704404363 has 4 divisors (see below), whose sum is σ = 21784494688. Its totient is φ = 21624314040.

The previous prime is 21704404357. The next prime is 21704404367. The reversal of 21704404363 is 36340440712.

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 21704404363 - 2²⁹ = 21167533451 is a prime.

It is a super-2 number, since 2×21704404363² (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 (21704404367) 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, 40044756 + ... + 40045297.

It is an arithmetic number, because the mean of its divisors is an integer number (5446123672).

Almost surely, 2^21704404363 is an apocalyptic number.

21704404363 is a deficient number, since it is larger than the sum of its proper divisors (80090325).

21704404363 is an equidigital number, since it uses as much as digits as its factorization.

21704404363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80090324.

The product of its (nonzero) digits is 48384, while the sum is 34.

The spelling of 21704404363 in words is "twenty-one billion, seven hundred four million, four hundred four thousand, three hundred sixty-three".