21322130365 has 4 divisors (see below), whose sum is σ = 25586556444. Its totient is φ = 17057704288.

The previous prime is 21322130363. The next prime is 21322130387. The reversal of 21322130365 is 56303122312.

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 9669575556 + 11652554809 = 98334^2 + 107947^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322130365 - 2¹ = 21322130363 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 (21322130363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2132213032 + ... + 2132213041.

It is an arithmetic number, because the mean of its divisors is an integer number (6396639111).

Almost surely, 2^21322130365 is an apocalyptic number.

It is an amenable number.

21322130365 is a deficient number, since it is larger than the sum of its proper divisors (4264426079).

21322130365 is an equidigital number, since it uses as much as digits as its factorization.

21322130365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264426078.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 21322130365 its reverse (56303122312), we get a palindrome (77625252677).

The spelling of 21322130365 in words is "twenty-one billion, three hundred twenty-two million, one hundred thirty thousand, three hundred sixty-five".