21331106 has 8 divisors (see below), whose sum is σ = 32401920. Its totient is φ = 10530468.

The previous prime is 21331103. The next prime is 21331109. The reversal of 21331106 is 60113312.

It is an interprime number because it is at equal distance from previous prime (21331103) and next prime (21331109).

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

It is not an unprimeable number, because it can be changed into a prime (21331103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67346 + ... + 67661.

It is an arithmetic number, because the mean of its divisors is an integer number (4050240).

Almost surely, 2^21331106 is an apocalyptic number.

21331106 is a deficient number, since it is larger than the sum of its proper divisors (11070814).

21331106 is a wasteful number, since it uses less digits than its factorization.

21331106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135088.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 21331106 is about 4618.5610313170. The cubic root of 21331106 is about 277.3348572376.

Adding to 21331106 its reverse (60113312), we get a palindrome (81444418).

The spelling of 21331106 in words is "twenty-one million, three hundred thirty-one thousand, one hundred six".