21601036453 has 2 divisors, whose sum is σ = 21601036454. Its totient is φ = 21601036452.

The previous prime is 21601036441. The next prime is 21601036493. The reversal of 21601036453 is 35463010612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20106672804 + 1494363649 = 141798^2 + 38657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21601036453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21601036403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800518226 + 10800518227.

It is an arithmetic number, because the mean of its divisors is an integer number (10800518227).

Almost surely, 2^21601036453 is an apocalyptic number.

It is an amenable number.

21601036453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21601036453 is an equidigital number, since it uses as much as digits as its factorization.

21601036453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21601036453 in words is "twenty-one billion, six hundred one million, thirty-six thousand, four hundred fifty-three".