21965854 has 8 divisors (see below), whose sum is σ = 32968728. Its totient is φ = 10976280.

The previous prime is 21965837. The next prime is 21965861. The reversal of 21965854 is 45856912.

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, 4344 + ... + 7924.

It is an arithmetic number, because the mean of its divisors is an integer number (4121091).

Almost surely, 2^21965854 is an apocalyptic number.

21965854 is a deficient number, since it is larger than the sum of its proper divisors (11002874).

21965854 is a wasteful number, since it uses less digits than its factorization.

21965854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650.

The product of its digits is 86400, while the sum is 40.

The square root of 21965854 is about 4686.7743705026. The cubic root of 21965854 is about 280.0588906742.

The spelling of 21965854 in words is "twenty-one million, nine hundred sixty-five thousand, eight hundred fifty-four".