21375046 has 16 divisors (see below), whose sum is σ = 39974400. Its totient is φ = 8327880.

The previous prime is 21375043. The next prime is 21375049. The reversal of 21375046 is 64057312.

It is an interprime number because it is at equal distance from previous prime (21375043) and next prime (21375049).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69246 + ... + 69553.

It is an arithmetic number, because the mean of its divisors is an integer number (2498400).

Almost surely, 2^21375046 is an apocalyptic number.

21375046 is a deficient number, since it is larger than the sum of its proper divisors (18599354).

21375046 is a wasteful number, since it uses less digits than its factorization.

21375046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138819.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21375046 is about 4623.3154770143. The cubic root of 21375046 is about 277.5251542277.

The spelling of 21375046 in words is "twenty-one million, three hundred seventy-five thousand, forty-six".