21075106 has 8 divisors (see below), whose sum is σ = 34044444. Its totient is φ = 9726960.

The previous prime is 21075091. The next prime is 21075113. The reversal of 21075106 is 60157012.

It can be written as a sum of positive squares in 2 ways, for example, as 19228225 + 1846881 = 4385^2 + 1359^2 .

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

It is a super-2 number, since 2×21075106² = 888320185822472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405265 + ... + 405316.

Almost surely, 2^21075106 is an apocalyptic number.

21075106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21075106 is a deficient number, since it is larger than the sum of its proper divisors (12969338).

21075106 is a wasteful number, since it uses less digits than its factorization.

21075106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810596.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 21075106 is about 4590.7631173913. The cubic root of 21075106 is about 276.2209338596.

The spelling of 21075106 in words is "twenty-one million, seventy-five thousand, one hundred six".