21427425742 has 16 divisors (see below), whose sum is σ = 33324129792. Its totient is φ = 10322427960.

The previous prime is 21427425709. The next prime is 21427425743. The reversal of 21427425742 is 24752472412.

It is a happy number.

21427425742 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21427425695 and 21427425704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21427425743) 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 in 7 ways as a sum of consecutive naturals, for example, 747168 + ... + 775315.

It is an arithmetic number, because the mean of its divisors is an integer number (2082758112).

Almost surely, 2^21427425742 is an apocalyptic number.

21427425742 is a deficient number, since it is larger than the sum of its proper divisors (11896704050).

21427425742 is a wasteful number, since it uses less digits than its factorization.

21427425742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522743.

The product of its digits is 250880, while the sum is 40.

The spelling of 21427425742 in words is "twenty-one billion, four hundred twenty-seven million, four hundred twenty-five thousand, seven hundred forty-two".