21023252454289 has 2 divisors, whose sum is σ = 21023252454290. Its totient is φ = 21023252454288.

The previous prime is 21023252454283. The next prime is 21023252454317. The reversal of 21023252454289 is 98245425232012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12908872923664 + 8114379530625 = 3592892^2 + 2848575^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023252454289 - 2⁵ = 21023252454257 is a prime.

It is not a weakly prime, because it can be changed into another prime (21023252454283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511626227144 + 10511626227145.

It is an arithmetic number, because the mean of its divisors is an integer number (10511626227145).

Almost surely, 2^{21023252454289} is an apocalyptic number.

It is an amenable number.

21023252454289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023252454289 is an equidigital number, since it uses as much as digits as its factorization.

21023252454289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2764800, while the sum is 49.

The spelling of 21023252454289 in words is "twenty-one trillion, twenty-three billion, two hundred fifty-two million, four hundred fifty-four thousand, two hundred eighty-nine".