21363665053 has 2 divisors, whose sum is σ = 21363665054. Its totient is φ = 21363665052.

The previous prime is 21363665051. The next prime is 21363665083. The reversal of 21363665053 is 35056636312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15183661284 + 6180003769 = 123222^2 + 78613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21363665053 - 2¹ = 21363665051 is a prime.

Together with 21363665051, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21363664997 and 21363665015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21363665051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681832526 + 10681832527.

It is an arithmetic number, because the mean of its divisors is an integer number (10681832527).

Almost surely, 2^21363665053 is an apocalyptic number.

It is an amenable number.

21363665053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21363665053 is an equidigital number, since it uses as much as digits as its factorization.

21363665053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 40.

The spelling of 21363665053 in words is "twenty-one billion, three hundred sixty-three million, six hundred sixty-five thousand, fifty-three".