21465043583 has 2 divisors, whose sum is σ = 21465043584. Its totient is φ = 21465043582.

The previous prime is 21465043577. The next prime is 21465043637. The reversal of 21465043583 is 38534056412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21465043583 - 2³⁰ = 20391301759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21465043583.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21465043283) 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 as a sum of consecutive naturals, namely, 10732521791 + 10732521792.

It is an arithmetic number, because the mean of its divisors is an integer number (10732521792).

Almost surely, 2^21465043583 is an apocalyptic number.

21465043583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21465043583 is an equidigital number, since it uses as much as digits as its factorization.

21465043583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 21465043583 its reverse (38534056412), we get a palindrome (59999099995).

The spelling of 21465043583 in words is "twenty-one billion, four hundred sixty-five million, forty-three thousand, five hundred eighty-three".