21059105 has 16 divisors (see below), whose sum is σ = 26356800. Its totient is φ = 16137792.

The previous prime is 21059089. The next prime is 21059119. The reversal of 21059105 is 50195012.

It is a cyclic number.

It is not a de Polignac number, because 21059105 - 2⁴ = 21059089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11546 + ... + 13244.

It is an arithmetic number, because the mean of its divisors is an integer number (1647300).

Almost surely, 2^21059105 is an apocalyptic number.

It is an amenable number.

21059105 is a deficient number, since it is larger than the sum of its proper divisors (5297695).

21059105 is a wasteful number, since it uses less digits than its factorization.

21059105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 21059105 is about 4589.0200478969. The cubic root of 21059105 is about 276.1510104439.

The spelling of 21059105 in words is "twenty-one million, fifty-nine thousand, one hundred five".