21450544142327 has 2 divisors, whose sum is σ = 21450544142328. Its totient is φ = 21450544142326.

The previous prime is 21450544142303. The next prime is 21450544142333. The reversal of 21450544142327 is 72324144505412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21450544142327 - 2²⁰ = 21450543093751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450544142827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725272071163 + 10725272071164.

It is an arithmetic number, because the mean of its divisors is an integer number (10725272071164).

Almost surely, 2^{21450544142327} is an apocalyptic number.

21450544142327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450544142327 is an equidigital number, since it uses as much as digits as its factorization.

21450544142327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1075200, while the sum is 44.

Adding to 21450544142327 its reverse (72324144505412), we get a palindrome (93774688647739).

The spelling of 21450544142327 in words is "twenty-one trillion, four hundred fifty billion, five hundred forty-four million, one hundred forty-two thousand, three hundred twenty-seven".