21936426 has 16 divisors (see below), whose sum is σ = 46453824. Its totient is φ = 6881984.

The previous prime is 21936419. The next prime is 21936463. The reversal of 21936426 is 62463912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107430 + ... + 107633.

It is an arithmetic number, because the mean of its divisors is an integer number (2903364).

Almost surely, 2^21936426 is an apocalyptic number.

21936426 is an abundant number, since it is smaller than the sum of its proper divisors (24517398).

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

21936426 is a wasteful number, since it uses less digits than its factorization.

21936426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215085.

The product of its digits is 15552, while the sum is 33.

The square root of 21936426 is about 4683.6338456374. The cubic root of 21936426 is about 279.9337683483.

The spelling of 21936426 in words is "twenty-one million, nine hundred thirty-six thousand, four hundred twenty-six".