21404626 has 8 divisors (see below), whose sum is σ = 32853744. Its totient is φ = 10453380.

The previous prime is 21404623. The next prime is 21404653. The reversal of 21404626 is 62640412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21404626.

It is not an unprimeable number, because it can be changed into a prime (21404623) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 124360 + ... + 124531.

It is an arithmetic number, because the mean of its divisors is an integer number (4106718).

Almost surely, 2^21404626 is an apocalyptic number.

21404626 is a deficient number, since it is larger than the sum of its proper divisors (11449118).

21404626 is a wasteful number, since it uses less digits than its factorization.

21404626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248936.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21404626 is about 4626.5133740215. The cubic root of 21404626 is about 277.6531135654.

The spelling of 21404626 in words is "twenty-one million, four hundred four thousand, six hundred twenty-six".