21036766 has 16 divisors (see below), whose sum is σ = 33187968. Its totient is φ = 9981400.

The previous prime is 21036751. The next prime is 21036767. The reversal of 21036766 is 66763012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (2074248).

Almost surely, 2^21036766 is an apocalyptic number.

21036766 is a deficient number, since it is larger than the sum of its proper divisors (12151202).

21036766 is a wasteful number, since it uses less digits than its factorization.

21036766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3647.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 21036766 is about 4586.5854401722. The cubic root of 21036766 is about 276.0533310791.

Adding to 21036766 its reverse (66763012), we get a palindrome (87799778).

The spelling of 21036766 in words is "twenty-one million, thirty-six thousand, seven hundred sixty-six".