21059106 has 64 divisors (see below), whose sum is σ = 47001600. Its totient is φ = 6264000.

The previous prime is 21059089. The next prime is 21059119. The reversal of 21059106 is 60195012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208456 + ... + 208556.

It is an arithmetic number, because the mean of its divisors is an integer number (734400).

Almost surely, 2^21059106 is an apocalyptic number.

21059106 is an abundant number, since it is smaller than the sum of its proper divisors (25942494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21059106 is a wasteful number, since it uses less digits than its factorization.

21059106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 21059106 is about 4589.0201568527. The cubic root of 21059106 is about 276.1510148149.

It can be divided in two parts, 2105 and 9106, that added together give a palindrome (11211).

The spelling of 21059106 in words is "twenty-one million, fifty-nine thousand, one hundred six".