21114666 has 24 divisors (see below), whose sum is σ = 46378020. Its totient is φ = 6941376.

The previous prime is 21114659. The next prime is 21114671. The reversal of 21114666 is 66641112.

It can be written as a sum of positive squares in 2 ways, for example, as 20930625 + 184041 = 4575^2 + 429^2 .

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 11 ways as a sum of consecutive naturals, for example, 6721 + ... + 9348.

Almost surely, 2^21114666 is an apocalyptic number.

21114666 is an abundant number, since it is smaller than the sum of its proper divisors (25263354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21114666 is a wasteful number, since it uses less digits than its factorization.

21114666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16150 (or 16147 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 21114666 is about 4595.0697491986. The cubic root of 21114666 is about 276.3936569144.

Adding to 21114666 its reverse (66641112), we get a palindrome (87755778).

The spelling of 21114666 in words is "twenty-one million, one hundred fourteen thousand, six hundred sixty-six".