21110554459 has 2 divisors, whose sum is σ = 21110554460. Its totient is φ = 21110554458.

The previous prime is 21110554427. The next prime is 21110554471. The reversal of 21110554459 is 95445501112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21110554459 - 2⁵ = 21110554427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21110554489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555277229 + 10555277230.

It is an arithmetic number, because the mean of its divisors is an integer number (10555277230).

Almost surely, 2^21110554459 is an apocalyptic number.

21110554459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110554459 is an equidigital number, since it uses as much as digits as its factorization.

21110554459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 21110554459 in words is "twenty-one billion, one hundred ten million, five hundred fifty-four thousand, four hundred fifty-nine".