21093878 has 16 divisors (see below), whose sum is σ = 34586160. Its totient is φ = 9589536.

The previous prime is 21093833. The next prime is 21093899. The reversal of 21093878 is 87839012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4313 + ... + 7796.

It is an arithmetic number, because the mean of its divisors is an integer number (2161635).

Almost surely, 2^21093878 is an apocalyptic number.

21093878 is a deficient number, since it is larger than the sum of its proper divisors (13492282).

21093878 is a wasteful number, since it uses less digits than its factorization.

21093878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12191.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 21093878 is about 4592.8072025723. The cubic root of 21093878 is about 276.3029212781.

The spelling of 21093878 in words is "twenty-one million, ninety-three thousand, eight hundred seventy-eight".