21455415324143 has 2 divisors, whose sum is σ = 21455415324144. Its totient is φ = 21455415324142.

The previous prime is 21455415323977. The next prime is 21455415324179. The reversal of 21455415324143 is 34142351455412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21455415324143 - 2²² = 21455411129839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21455415324094 and 21455415324103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21455415324943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727707662071 + 10727707662072.

It is an arithmetic number, because the mean of its divisors is an integer number (10727707662072).

Almost surely, 2^{21455415324143} is an apocalyptic number.

21455415324143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455415324143 is an equidigital number, since it uses as much as digits as its factorization.

21455415324143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 44.

Adding to 21455415324143 its reverse (34142351455412), we get a palindrome (55597766779555).

The spelling of 21455415324143 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifteen million, three hundred twenty-four thousand, one hundred forty-three".