21440118938 has 96 divisors (see below), whose sum is σ = 39328861824. Its totient is φ = 8576575488.

The previous prime is 21440118937. The next prime is 21440118949. The reversal of 21440118938 is 83981104412.

It is a junction number, because it is equal to n+sod(n) for n = 21440118895 and 21440118904.

It is not an unprimeable number, because it can be changed into a prime (21440118937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221032106 + ... + 221032202.

It is an arithmetic number, because the mean of its divisors is an integer number (409675644).

Almost surely, 2^21440118938 is an apocalyptic number.

21440118938 is a deficient number, since it is larger than the sum of its proper divisors (17888742886).

21440118938 is an equidigital number, since it uses as much as digits as its factorization.

21440118938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 21440118938 in words is "twenty-one billion, four hundred forty million, one hundred eighteen thousand, nine hundred thirty-eight".