21442886 has 8 divisors (see below), whose sum is σ = 33201984. Its totient is φ = 10375560.

The previous prime is 21442871. The next prime is 21442913. The reversal of 21442886 is 68824412.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172865 + ... + 172988.

It is an arithmetic number, because the mean of its divisors is an integer number (4150248).

Almost surely, 2^21442886 is an apocalyptic number.

21442886 is a deficient number, since it is larger than the sum of its proper divisors (11759098).

21442886 is a wasteful number, since it uses less digits than its factorization.

21442886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345886.

The product of its digits is 24576, while the sum is 35.

The square root of 21442886 is about 4630.6463911640. The cubic root of 21442886 is about 277.8184467506.

The spelling of 21442886 in words is "twenty-one million, four hundred forty-two thousand, eight hundred eighty-six".