21066435 has 24 divisors (see below), whose sum is σ = 39325104. Its totient is φ = 10370880.

The previous prime is 21066403. The next prime is 21066443. The reversal of 21066435 is 53466012.

21066435 is a `hidden beast` number, since 2 + 10 + 6 + 643 + 5 = 666.

It is not a de Polignac number, because 21066435 - 2⁵ = 21066403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21066399 and 21066408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17421 + ... + 18590.

It is an arithmetic number, because the mean of its divisors is an integer number (1638546).

Almost surely, 2^21066435 is an apocalyptic number.

21066435 is a deficient number, since it is larger than the sum of its proper divisors (18258669).

21066435 is a wasteful number, since it uses less digits than its factorization.

21066435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36035 (or 36032 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 21066435 is about 4589.8186238674. The cubic root of 21066435 is about 276.1830465014.

The spelling of 21066435 in words is "twenty-one million, sixty-six thousand, four hundred thirty-five".