21169683937 has 2 divisors, whose sum is σ = 21169683938. Its totient is φ = 21169683936.

The previous prime is 21169683923. The next prime is 21169684001. The reversal of 21169683937 is 73938696112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18498448081 + 2671235856 = 136009^2 + 51684^2 .

It is a cyclic number.

It is not a de Polignac number, because 21169683937 - 2¹⁵ = 21169651169 is a prime.

It is not a weakly prime, because it can be changed into another prime (21169683037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10584841968 + 10584841969.

It is an arithmetic number, because the mean of its divisors is an integer number (10584841969).

Almost surely, 2^21169683937 is an apocalyptic number.

It is an amenable number.

21169683937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21169683937 is an equidigital number, since it uses as much as digits as its factorization.

21169683937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 55.

The spelling of 21169683937 in words is "twenty-one billion, one hundred sixty-nine million, six hundred eighty-three thousand, nine hundred thirty-seven".