21420223459 has 2 divisors, whose sum is σ = 21420223460. Its totient is φ = 21420223458.

The previous prime is 21420223421. The next prime is 21420223463. The reversal of 21420223459 is 95432202412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21420223459 - 2¹⁵ = 21420190691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21420226459) 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, 10710111729 + 10710111730.

It is an arithmetic number, because the mean of its divisors is an integer number (10710111730).

Almost surely, 2^21420223459 is an apocalyptic number.

21420223459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420223459 is an equidigital number, since it uses as much as digits as its factorization.

21420223459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21420223459 in words is "twenty-one billion, four hundred twenty million, two hundred twenty-three thousand, four hundred fifty-nine".