21196116937 has 2 divisors, whose sum is σ = 21196116938. Its totient is φ = 21196116936.

The previous prime is 21196116871. The next prime is 21196116943. The reversal of 21196116937 is 73961169112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17336725561 + 3859391376 = 131669^2 + 62124^2 .

It is a cyclic number.

It is not a de Polignac number, because 21196116937 - 2¹¹ = 21196114889 is a prime.

It is not a weakly prime, because it can be changed into another prime (21196113937) 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, 10598058468 + 10598058469.

It is an arithmetic number, because the mean of its divisors is an integer number (10598058469).

Almost surely, 2^21196116937 is an apocalyptic number.

It is an amenable number.

21196116937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21196116937 is an equidigital number, since it uses as much as digits as its factorization.

21196116937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The spelling of 21196116937 in words is "twenty-one billion, one hundred ninety-six million, one hundred sixteen thousand, nine hundred thirty-seven".