21434455421089 has 2 divisors, whose sum is σ = 21434455421090. Its totient is φ = 21434455421088.

The previous prime is 21434455420999. The next prime is 21434455421101. The reversal of 21434455421089 is 98012455443412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17444129564689 + 3990325856400 = 4176617^2 + 1997580^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434455421089 - 2³⁹ = 20884699607201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21434455422089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717227710544 + 10717227710545.

It is an arithmetic number, because the mean of its divisors is an integer number (10717227710545).

Almost surely, 2^{21434455421089} is an apocalyptic number.

It is an amenable number.

21434455421089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434455421089 is an equidigital number, since it uses as much as digits as its factorization.

21434455421089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5529600, while the sum is 52.

The spelling of 21434455421089 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred fifty-five million, four hundred twenty-one thousand, eighty-nine".