21868054 has 8 divisors (see below), whose sum is σ = 35325360. Its totient is φ = 10092936.

The previous prime is 21868043. The next prime is 21868081. The reversal of 21868054 is 45086812.

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, 420514 + ... + 420565.

It is an arithmetic number, because the mean of its divisors is an integer number (4415670).

Almost surely, 2^21868054 is an apocalyptic number.

21868054 is a deficient number, since it is larger than the sum of its proper divisors (13457306).

21868054 is a wasteful number, since it uses less digits than its factorization.

21868054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841094.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 21868054 is about 4676.3291158771. The cubic root of 21868054 is about 279.6426308118.

The spelling of 21868054 in words is "twenty-one million, eight hundred sixty-eight thousand, fifty-four".