21321364445 has 4 divisors (see below), whose sum is σ = 25585637340. Its totient is φ = 17057091552.

The previous prime is 21321364423. The next prime is 21321364451. The reversal of 21321364445 is 54446312312.

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 3779421529 + 17541942916 = 61477^2 + 132446^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321364445 - 2⁶ = 21321364381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2132136440 + ... + 2132136449.

It is an arithmetic number, because the mean of its divisors is an integer number (6396409335).

Almost surely, 2^21321364445 is an apocalyptic number.

It is an amenable number.

21321364445 is a deficient number, since it is larger than the sum of its proper divisors (4264272895).

21321364445 is an equidigital number, since it uses as much as digits as its factorization.

21321364445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4264272894.

The product of its digits is 69120, while the sum is 35.

Adding to 21321364445 its reverse (54446312312), we get a palindrome (75767676757).

The spelling of 21321364445 in words is "twenty-one billion, three hundred twenty-one million, three hundred sixty-four thousand, four hundred forty-five".