21425124011 has 2 divisors, whose sum is σ = 21425124012. Its totient is φ = 21425124010.

The previous prime is 21425123927. The next prime is 21425124121. The reversal of 21425124011 is 11042152412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21425124011 - 2³⁰ = 20351382187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21425144011) 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, 10712562005 + 10712562006.

It is an arithmetic number, because the mean of its divisors is an integer number (10712562006).

Almost surely, 2^21425124011 is an apocalyptic number.

21425124011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425124011 is an equidigital number, since it uses as much as digits as its factorization.

21425124011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 21425124011 its reverse (11042152412), we get a palindrome (32467276423).

The spelling of 21425124011 in words is "twenty-one billion, four hundred twenty-five million, one hundred twenty-four thousand, eleven".