21196532737 has 2 divisors, whose sum is σ = 21196532738. Its totient is φ = 21196532736.

The previous prime is 21196532681. The next prime is 21196532801. The reversal of 21196532737 is 73723569112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18098051841 + 3098480896 = 134529^2 + 55664^2 .

It is a cyclic number.

It is not a de Polignac number, because 21196532737 - 2¹¹ = 21196530689 is a prime.

It is a super-2 number, since 2×21196532737² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21196532237) 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 as a sum of consecutive naturals, namely, 10598266368 + 10598266369.

It is an arithmetic number, because the mean of its divisors is an integer number (10598266369).

Almost surely, 2^21196532737 is an apocalyptic number.

It is an amenable number.

21196532737 is a deficient number, since it is larger than the sum of its proper divisors (1).

21196532737 is an equidigital number, since it uses as much as digits as its factorization.

21196532737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 46.

The spelling of 21196532737 in words is "twenty-one billion, one hundred ninety-six million, five hundred thirty-two thousand, seven hundred thirty-seven".