21675854 has 8 divisors (see below), whose sum is σ = 32540520. Its totient is φ = 10829016.

The previous prime is 21675853. The next prime is 21675869. The reversal of 21675854 is 45857612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 824 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (4067565).

Almost surely, 2^21675854 is an apocalyptic number.

21675854 is a deficient number, since it is larger than the sum of its proper divisors (10864666).

21675854 is a wasteful number, since it uses less digits than its factorization.

21675854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8914.

The product of its digits is 67200, while the sum is 38.

The square root of 21675854 is about 4655.7334545698. The cubic root of 21675854 is about 278.8209519963.

The spelling of 21675854 in words is "twenty-one million, six hundred seventy-five thousand, eight hundred fifty-four".