21066135 has 16 divisors (see below), whose sum is σ = 34617696. Its totient is φ = 10931328.

The previous prime is 21066113. The next prime is 21066181. The reversal of 21066135 is 53166012.

It is not a de Polignac number, because 21066135 - 2⁷ = 21066007 is a prime.

It is a congruent number.

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, 18424 + ... + 19533.

It is an arithmetic number, because the mean of its divisors is an integer number (2163606).

Almost surely, 2^21066135 is an apocalyptic number.

21066135 is a deficient number, since it is larger than the sum of its proper divisors (13551561).

21066135 is a wasteful number, since it uses less digits than its factorization.

21066135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38002.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21066135 is about 4589.7859427211. The cubic root of 21066135 is about 276.1817354853.

The spelling of 21066135 in words is "twenty-one million, sixty-six thousand, one hundred thirty-five".