21095854 has 8 divisors (see below), whose sum is σ = 34077960. Its totient is φ = 9736536.

The previous prime is 21095849. The next prime is 21095869. The reversal of 21095854 is 45859012.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 405664 + ... + 405715.

It is an arithmetic number, because the mean of its divisors is an integer number (4259745).

Almost surely, 2^21095854 is an apocalyptic number.

21095854 is a deficient number, since it is larger than the sum of its proper divisors (12982106).

21095854 is a wasteful number, since it uses less digits than its factorization.

21095854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811394.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 21095854 is about 4593.0223165145. The cubic root of 21095854 is about 276.3115487027.

The spelling of 21095854 in words is "twenty-one million, ninety-five thousand, eight hundred fifty-four".