21271838 has 8 divisors (see below), whose sum is σ = 36466032. Its totient is φ = 9116496.

The previous prime is 21271837. The next prime is 21271841. The reversal of 21271838 is 83817212.

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 (21271837) by changing a digit.

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, 759695 + ... + 759722.

It is an arithmetic number, because the mean of its divisors is an integer number (4558254).

Almost surely, 2^21271838 is an apocalyptic number.

21271838 is a deficient number, since it is larger than the sum of its proper divisors (15194194).

21271838 is a wasteful number, since it uses less digits than its factorization.

21271838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519426.

The product of its digits is 5376, while the sum is 32.

The square root of 21271838 is about 4612.1402840764. The cubic root of 21271838 is about 277.0777627513.

The spelling of 21271838 in words is "twenty-one million, two hundred seventy-one thousand, eight hundred thirty-eight".