21439066 has 32 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 9416880.

The previous prime is 21438961. The next prime is 21439079. The reversal of 21439066 is 66093412.

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 15 ways as a sum of consecutive naturals, for example, 107635 + ... + 107833.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^21439066 is an apocalyptic number.

21439066 is a deficient number, since it is larger than the sum of its proper divisors (14848934).

21439066 is a wasteful number, since it uses less digits than its factorization.

21439066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 21439066 is about 4630.2339033790. The cubic root of 21439066 is about 277.8019482020.

The spelling of 21439066 in words is "twenty-one million, four hundred thirty-nine thousand, sixty-six".