19425095021 has 2 divisors, whose sum is σ = 19425095022. Its totient is φ = 19425095020.

The previous prime is 19425094991. The next prime is 19425095023. The reversal of 19425095021 is 12059052491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13991341225 + 5433753796 = 118285^2 + 73714^2 .

It is a cyclic number.

It is not a de Polignac number, because 19425095021 - 2⁶ = 19425094957 is a prime.

Together with 19425095023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19425095023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9712547510 + 9712547511.

It is an arithmetic number, because the mean of its divisors is an integer number (9712547511).

Almost surely, 2^19425095021 is an apocalyptic number.

It is an amenable number.

19425095021 is a deficient number, since it is larger than the sum of its proper divisors (1).

19425095021 is an equidigital number, since it uses as much as digits as its factorization.

19425095021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 19425095021 in words is "nineteen billion, four hundred twenty-five million, ninety-five thousand, twenty-one".