21769756 has 12 divisors (see below), whose sum is σ = 38525760. Its totient is φ = 10762400.

The previous prime is 21769751. The next prime is 21769757. The reversal of 21769756 is 65796712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21769751) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30220 + ... + 30931.

It is an arithmetic number, because the mean of its divisors is an integer number (3210480).

Almost surely, 2^21769756 is an apocalyptic number.

It is an amenable number.

21769756 is a deficient number, since it is larger than the sum of its proper divisors (16756004).

21769756 is a wasteful number, since it uses less digits than its factorization.

21769756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61244 (or 61242 counting only the distinct ones).

The product of its digits is 158760, while the sum is 43.

The square root of 21769756 is about 4665.8071113153. The cubic root of 21769756 is about 279.2229988744. Note that the first 3 decimals are identical.

The spelling of 21769756 in words is "twenty-one million, seven hundred sixty-nine thousand, seven hundred fifty-six".