21246105 has 16 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 11280768.

The previous prime is 21246101. The next prime is 21246131. The reversal of 21246105 is 50164212.

It is not a de Polignac number, because 21246105 - 2² = 21246101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21246101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2134080).

Almost surely, 2^21246105 is an apocalyptic number.

It is an amenable number.

21246105 is a deficient number, since it is larger than the sum of its proper divisors (12899175).

21246105 is a wasteful number, since it uses less digits than its factorization.

21246105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21246105 is about 4609.3497372189. The cubic root of 21246105 is about 276.9659886908.

The spelling of 21246105 in words is "twenty-one million, two hundred forty-six thousand, one hundred five".