21126966 has 32 divisors (see below), whose sum is σ = 49206528. Its totient is φ = 5921760.

The previous prime is 21126961. The next prime is 21126967. The reversal of 21126966 is 66962112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2520 + ... + 6971.

It is an arithmetic number, because the mean of its divisors is an integer number (1537704).

Almost surely, 2^21126966 is an apocalyptic number.

21126966 is an abundant number, since it is smaller than the sum of its proper divisors (28079562).

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

21126966 is a wasteful number, since it uses less digits than its factorization.

21126966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556.

The product of its digits is 7776, while the sum is 33.

The square root of 21126966 is about 4596.4079453417. The cubic root of 21126966 is about 276.4473160166.

The spelling of 21126966 in words is "twenty-one million, one hundred twenty-six thousand, nine hundred sixty-six".