21945986426 has 96 divisors (see below), whose sum is σ = 45074921472. Its totient is φ = 7907397120.

The previous prime is 21945986417. The next prime is 21945986431. The reversal of 21945986426 is 62468954912.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 655055 + ... + 687741.

It is an arithmetic number, because the mean of its divisors is an integer number (469530432).

Almost surely, 2^21945986426 is an apocalyptic number.

21945986426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21945986426 is an abundant number, since it is smaller than the sum of its proper divisors (23128935046).

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

21945986426 is a wasteful number, since it uses less digits than its factorization.

21945986426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32764 (or 32757 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 56.

The spelling of 21945986426 in words is "twenty-one billion, nine hundred forty-five million, nine hundred eighty-six thousand, four hundred twenty-six".