21674105 has 8 divisors (see below), whose sum is σ = 26248200. Its totient is φ = 17179776.

The previous prime is 21674071. The next prime is 21674113. The reversal of 21674105 is 50147612.

It can be written as a sum of positive squares in 4 ways, for example, as 1026169 + 20647936 = 1013^2 + 4544^2 .

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 21674105 - 2¹² = 21670009 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19340 + ... + 20429.

It is an arithmetic number, because the mean of its divisors is an integer number (3281025).

Almost surely, 2^21674105 is an apocalyptic number.

It is an amenable number.

21674105 is a deficient number, since it is larger than the sum of its proper divisors (4574095).

21674105 is a wasteful number, since it uses less digits than its factorization.

21674105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39883.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21674105 is about 4655.5456178626. The cubic root of 21674105 is about 278.8134525461.

The spelling of 21674105 in words is "twenty-one million, six hundred seventy-four thousand, one hundred five".