21040966 has 8 divisors (see below), whose sum is σ = 31611744. Its totient is φ = 10503720.

The previous prime is 21040963. The next prime is 21040967. The reversal of 21040966 is 66904012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6750 + ... + 9361.

It is an arithmetic number, because the mean of its divisors is an integer number (3951468).

Almost surely, 2^21040966 is an apocalyptic number.

21040966 is a deficient number, since it is larger than the sum of its proper divisors (10570778).

21040966 is a wasteful number, since it uses less digits than its factorization.

21040966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16766.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21040966 is about 4587.0432742672. The cubic root of 21040966 is about 276.0717012481.

Adding to 21040966 its reverse (66904012), we get a palindrome (87944978).

The spelling of 21040966 in words is "twenty-one million, forty thousand, nine hundred sixty-six".