21450611105447 has 2 divisors, whose sum is σ = 21450611105448. Its totient is φ = 21450611105446.

The previous prime is 21450611105401. The next prime is 21450611105453. The reversal of 21450611105447 is 74450111605412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21450611105447 - 2¹⁰ = 21450611104423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450611105467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725305552723 + 10725305552724.

It is an arithmetic number, because the mean of its divisors is an integer number (10725305552724).

Almost surely, 2^{21450611105447} is an apocalyptic number.

21450611105447 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450611105447 is an equidigital number, since it uses as much as digits as its factorization.

21450611105447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 21450611105447 in words is "twenty-one trillion, four hundred fifty billion, six hundred eleven million, one hundred five thousand, four hundred forty-seven".