21454444034459 has 2 divisors, whose sum is σ = 21454444034460. Its totient is φ = 21454444034458.

The previous prime is 21454444034381. The next prime is 21454444034521. The reversal of 21454444034459 is 95443044445412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21454444034459 - 2⁴⁴ = 3862257990043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21454444034459.

It is not a weakly prime, because it can be changed into another prime (21454444034659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727222017229 + 10727222017230.

It is an arithmetic number, because the mean of its divisors is an integer number (10727222017230).

Almost surely, 2^{21454444034459} is an apocalyptic number.

21454444034459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21454444034459 is an equidigital number, since it uses as much as digits as its factorization.

21454444034459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22118400, while the sum is 53.

The spelling of 21454444034459 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred forty-four million, thirty-four thousand, four hundred fifty-nine".