21450611105453 has 2 divisors, whose sum is σ = 21450611105454. Its totient is φ = 21450611105452.

The previous prime is 21450611105447. The next prime is 21450611105461. The reversal of 21450611105453 is 35450111605412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19780318515049 + 1670292590404 = 4447507^2 + 1292398^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450611105453 - 2⁶ = 21450611105389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450611101453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725305552726 + 10725305552727.

It is an arithmetic number, because the mean of its divisors is an integer number (10725305552727).

Almost surely, 2^{21450611105453} is an apocalyptic number.

It is an amenable number.

21450611105453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450611105453 is an equidigital number, since it uses as much as digits as its factorization.

21450611105453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 21450611105453 in words is "twenty-one trillion, four hundred fifty billion, six hundred eleven million, one hundred five thousand, four hundred fifty-three".