21096439854 has 32 divisors (see below), whose sum is σ = 48647174400. Its totient is φ = 5974211712.

The previous prime is 21096439853. The next prime is 21096439873. The reversal of 21096439854 is 45893469012.

21096439854 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21096439797 and 21096439806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096439853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2217804 + ... + 2227295.

It is an arithmetic number, because the mean of its divisors is an integer number (1520224200).

Almost surely, 2^21096439854 is an apocalyptic number.

21096439854 is an abundant number, since it is smaller than the sum of its proper divisors (27550734546).

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

21096439854 is a wasteful number, since it uses less digits than its factorization.

21096439854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445224.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 21096439854 in words is "twenty-one billion, ninety-six million, four hundred thirty-nine thousand, eight hundred fifty-four".