21066422 has 32 divisors (see below), whose sum is σ = 35804160. Its totient is φ = 9228960.

The previous prime is 21066403. The next prime is 21066443. The reversal of 21066422 is 22466012.

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, 47333 + ... + 47775.

It is an arithmetic number, because the mean of its divisors is an integer number (1118880).

Almost surely, 2^21066422 is an apocalyptic number.

21066422 is a deficient number, since it is larger than the sum of its proper divisors (14737738).

21066422 is a wasteful number, since it uses less digits than its factorization.

21066422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21066422 is about 4589.8172076892. The cubic root of 21066422 is about 276.1829896910.

The spelling of 21066422 in words is "twenty-one million, sixty-six thousand, four hundred twenty-two".