21771703756 has 36 divisors (see below), whose sum is σ = 42853013896. Its totient is φ = 9666074880.

The previous prime is 21771703753. The next prime is 21771703757. The reversal of 21771703756 is 65730717712.

It is not an unprimeable number, because it can be changed into a prime (21771703753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 502245 + ... + 543868.

Almost surely, 2^21771703756 is an apocalyptic number.

It is an amenable number.

21771703756 is a deficient number, since it is larger than the sum of its proper divisors (21081310140).

21771703756 is a wasteful number, since it uses less digits than its factorization.

21771703756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046182 (or 1046169 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 46.

It can be divided in two parts, 21771 and 703756, that added together give a palindrome (725527).

The spelling of 21771703756 in words is "twenty-one billion, seven hundred seventy-one million, seven hundred three thousand, seven hundred fifty-six".