21440118937 has 2 divisors, whose sum is σ = 21440118938. Its totient is φ = 21440118936.

The previous prime is 21440118929. The next prime is 21440118949. The reversal of 21440118937 is 73981104412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21051398281 + 388720656 = 145091^2 + 19716^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440118937 - 2³ = 21440118929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21440118937.

It is not a weakly prime, because it can be changed into another prime (21440118437) 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 as a sum of consecutive naturals, namely, 10720059468 + 10720059469.

It is an arithmetic number, because the mean of its divisors is an integer number (10720059469).

Almost surely, 2^21440118937 is an apocalyptic number.

It is an amenable number.

21440118937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440118937 is an equidigital number, since it uses as much as digits as its factorization.

21440118937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 21440118937 in words is "twenty-one billion, four hundred forty million, one hundred eighteen thousand, nine hundred thirty-seven".