21916987756 has 24 divisors (see below), whose sum is σ = 38615559696. Its totient is φ = 10884218880.

The previous prime is 21916987751. The next prime is 21916987823. The reversal of 21916987756 is 65778961912.

It is a junction number, because it is equal to n+sod(n) for n = 21916987694 and 21916987703.

It is not an unprimeable number, because it can be changed into a prime (21916987751) 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 7 ways as a sum of consecutive naturals, for example, 325996 + ... + 387436.

It is an arithmetic number, because the mean of its divisors is an integer number (1608981654).

Almost surely, 2^21916987756 is an apocalyptic number.

It is an amenable number.

21916987756 is a deficient number, since it is larger than the sum of its proper divisors (16698571940).

21916987756 is a wasteful number, since it uses less digits than its factorization.

21916987756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62049 (or 62047 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 61.

The spelling of 21916987756 in words is "twenty-one billion, nine hundred sixteen million, nine hundred eighty-seven thousand, seven hundred fifty-six".