21716602445 has 4 divisors (see below), whose sum is σ = 26059922940. Its totient is φ = 17373281952.

The previous prime is 21716602423. The next prime is 21716602447. The reversal of 21716602445 is 54420661712.

It is a happy number.

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 4220191369 + 17496411076 = 64963^2 + 132274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21716602445 - 2¹⁰ = 21716601421 is a prime.

It is a super-2 number, since 2×21716602445² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21716602399 and 21716602408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716602447) 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, 2171660240 + ... + 2171660249.

It is an arithmetic number, because the mean of its divisors is an integer number (6514980735).

Almost surely, 2^21716602445 is an apocalyptic number.

It is an amenable number.

21716602445 is a deficient number, since it is larger than the sum of its proper divisors (4343320495).

21716602445 is an equidigital number, since it uses as much as digits as its factorization.

21716602445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4343320494.

The product of its (nonzero) digits is 80640, while the sum is 38.

The spelling of 21716602445 in words is "twenty-one billion, seven hundred sixteen million, six hundred two thousand, four hundred forty-five".