21127459 has 2 divisors, whose sum is σ = 21127460. Its totient is φ = 21127458.

The previous prime is 21127417. The next prime is 21127493. The reversal of 21127459 is 95472112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21127459 - 2⁷ = 21127331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21127459.

It is not a weakly prime, because it can be changed into another prime (21127499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563729 + 10563730.

It is an arithmetic number, because the mean of its divisors is an integer number (10563730).

Almost surely, 2^21127459 is an apocalyptic number.

21127459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21127459 is an equidigital number, since it uses as much as digits as its factorization.

21127459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 21127459 is about 4596.4615738631. The cubic root of 21127459 is about 276.4494663090.

The spelling of 21127459 in words is "twenty-one million, one hundred twenty-seven thousand, four hundred fifty-nine".