21406118 has 8 divisors (see below), whose sum is σ = 33216480. Its totient is φ = 10333960.

The previous prime is 21406109. The next prime is 21406153. The reversal of 21406118 is 81160412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21406093 and 21406102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184478 + ... + 184593.

It is an arithmetic number, because the mean of its divisors is an integer number (4152060).

Almost surely, 2^21406118 is an apocalyptic number.

21406118 is a deficient number, since it is larger than the sum of its proper divisors (11810362).

21406118 is a wasteful number, since it uses less digits than its factorization.

21406118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369102.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21406118 is about 4626.6746157473. The cubic root of 21406118 is about 277.6595646447.

The spelling of 21406118 in words is "twenty-one million, four hundred six thousand, one hundred eighteen".