21108371 has 8 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 20454280.

The previous prime is 21108361. The next prime is 21108377. The reversal of 21108371 is 17380112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21108371 - 2¹⁸ = 20846227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21108377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670 + ... + 6708.

It is an arithmetic number, because the mean of its divisors is an integer number (2721600).

Almost surely, 2^21108371 is an apocalyptic number.

21108371 is a deficient number, since it is larger than the sum of its proper divisors (664429).

21108371 is an equidigital number, since it uses as much as digits as its factorization.

21108371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5169.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 21108371 is about 4594.3847248571. The cubic root of 21108371 is about 276.3661867348.

Adding to 21108371 its reverse (17380112), we get a palindrome (38488483).

The spelling of 21108371 in words is "twenty-one million, one hundred eight thousand, three hundred seventy-one".