21066434 has 16 divisors (see below), whose sum is σ = 34172928. Its totient is φ = 9701952.

The previous prime is 21066403. The next prime is 21066443. The reversal of 21066434 is 43466012.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4994 + ... + 8189.

It is an arithmetic number, because the mean of its divisors is an integer number (2135808).

Almost surely, 2^21066434 is an apocalyptic number.

21066434 is a deficient number, since it is larger than the sum of its proper divisors (13106494).

21066434 is a wasteful number, since it uses less digits than its factorization.

21066434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13249.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 21066434 is about 4589.8185149306. The cubic root of 21066434 is about 276.1830421314.

The spelling of 21066434 in words is "twenty-one million, sixty-six thousand, four hundred thirty-four".