21267105 has 8 divisors (see below), whose sum is σ = 34027392. Its totient is φ = 11342448.

The previous prime is 21267091. The next prime is 21267107. The reversal of 21267105 is 50176212.

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

It is not a de Polignac number, because 21267105 - 2⁶ = 21267041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21267107) 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, 708889 + ... + 708918.

It is an arithmetic number, because the mean of its divisors is an integer number (4253424).

Almost surely, 2^21267105 is an apocalyptic number.

It is an amenable number.

21267105 is a deficient number, since it is larger than the sum of its proper divisors (12760287).

21267105 is a wasteful number, since it uses less digits than its factorization.

21267105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417815.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21267105 is about 4611.6271531857. The cubic root of 21267105 is about 277.0572112233.

The spelling of 21267105 in words is "twenty-one million, two hundred sixty-seven thousand, one hundred five".