21817325401 has 4 divisors (see below), whose sum is σ = 21826506292. Its totient is φ = 21808144512.

The previous prime is 21817325393. The next prime is 21817325407. The reversal of 21817325401 is 10452371812.

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 10928611600 + 10888713801 = 104540^2 + 104349^2 .

It is a cyclic number.

It is not a de Polignac number, because 21817325401 - 2³ = 21817325393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21817325407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4586880 + ... + 4591633.

It is an arithmetic number, because the mean of its divisors is an integer number (5456626573).

Almost surely, 2^21817325401 is an apocalyptic number.

It is an amenable number.

21817325401 is a deficient number, since it is larger than the sum of its proper divisors (9180891).

21817325401 is an equidigital number, since it uses as much as digits as its factorization.

21817325401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9180890.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 21817325401 in words is "twenty-one billion, eight hundred seventeen million, three hundred twenty-five thousand, four hundred one".