21982806737 has 2 divisors, whose sum is σ = 21982806738. Its totient is φ = 21982806736.

The previous prime is 21982806733. The next prime is 21982806793. The reversal of 21982806737 is 73760828912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11493769681 + 10489037056 = 107209^2 + 102416^2 .

It is a cyclic number.

It is not a de Polignac number, because 21982806737 - 2² = 21982806733 is a prime.

It is not a weakly prime, because it can be changed into another prime (21982806733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10991403368 + 10991403369.

It is an arithmetic number, because the mean of its divisors is an integer number (10991403369).

Almost surely, 2^21982806737 is an apocalyptic number.

It is an amenable number.

21982806737 is a deficient number, since it is larger than the sum of its proper divisors (1).

21982806737 is an equidigital number, since it uses as much as digits as its factorization.

21982806737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 21982806737 in words is "twenty-one billion, nine hundred eighty-two million, eight hundred six thousand, seven hundred thirty-seven".