21425210501239 has 2 divisors, whose sum is σ = 21425210501240. Its totient is φ = 21425210501238.

The previous prime is 21425210501129. The next prime is 21425210501269. The reversal of 21425210501239 is 93210501252412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21425210501239 - 2³⁵ = 21390850762871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21425210501198 and 21425210501207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21425210501269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712605250619 + 10712605250620.

It is an arithmetic number, because the mean of its divisors is an integer number (10712605250620).

Almost surely, 2^{21425210501239} is an apocalyptic number.

21425210501239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425210501239 is an equidigital number, since it uses as much as digits as its factorization.

21425210501239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 21425210501239 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred ten million, five hundred one thousand, two hundred thirty-nine".