21407425908 has 24 divisors (see below), whose sum is σ = 54491629920. Its totient is φ = 6487098720.

The previous prime is 21407425841. The next prime is 21407425939. The reversal of 21407425908 is 80952470412.

It is a self number, because there is not a number n which added to its sum of digits gives 21407425908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81088603 + ... + 81088866.

It is an arithmetic number, because the mean of its divisors is an integer number (2270484580).

Almost surely, 2^21407425908 is an apocalyptic number.

It is an amenable number.

21407425908 is an abundant number, since it is smaller than the sum of its proper divisors (33084204012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21407425908 is a wasteful number, since it uses less digits than its factorization.

21407425908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162177487 (or 162177485 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 21407425908 in words is "twenty-one billion, four hundred seven million, four hundred twenty-five thousand, nine hundred eight".