21766936 has 32 divisors (see below), whose sum is σ = 44712000. Its totient is φ = 9888256.

The previous prime is 21766931. The next prime is 21766939. The reversal of 21766936 is 63966712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21766931) 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, 1185 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (1397250).

Almost surely, 2^21766936 is an apocalyptic number.

It is an amenable number.

21766936 is an abundant number, since it is smaller than the sum of its proper divisors (22945064).

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

21766936 is a wasteful number, since it uses less digits than its factorization.

21766936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571 (or 5567 counting only the distinct ones).

The product of its digits is 81648, while the sum is 40.

The square root of 21766936 is about 4665.5049030089. The cubic root of 21766936 is about 279.2109417364.

The spelling of 21766936 in words is "twenty-one million, seven hundred sixty-six thousand, nine hundred thirty-six".