21336595453 has 2 divisors, whose sum is σ = 21336595454. Its totient is φ = 21336595452.

The previous prime is 21336595451. The next prime is 21336595543. The reversal of 21336595453 is 35459563312.

Together with next prime (21336595543) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21331478809 + 5116644 = 146053^2 + 2262^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336595453 - 2¹ = 21336595451 is a prime.

Together with 21336595451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21336595451) 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, 10668297726 + 10668297727.

It is an arithmetic number, because the mean of its divisors is an integer number (10668297727).

Almost surely, 2^21336595453 is an apocalyptic number.

It is an amenable number.

21336595453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336595453 is an equidigital number, since it uses as much as digits as its factorization.

21336595453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458000, while the sum is 46.

The spelling of 21336595453 in words is "twenty-one billion, three hundred thirty-six million, five hundred ninety-five thousand, four hundred fifty-three".