21010566610937 has 2 divisors, whose sum is σ = 21010566610938. Its totient is φ = 21010566610936.

The previous prime is 21010566610927. The next prime is 21010566610991. The reversal of 21010566610937 is 73901666501012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14710170427456 + 6300396183481 = 3835384^2 + 2510059^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010566610937 - 2²⁸ = 21010298175481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010566610891 and 21010566610900.

It is not a weakly prime, because it can be changed into another prime (21010566610907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505283305468 + 10505283305469.

It is an arithmetic number, because the mean of its divisors is an integer number (10505283305469).

Almost surely, 2^{21010566610937} is an apocalyptic number.

It is an amenable number.

21010566610937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010566610937 is an equidigital number, since it uses as much as digits as its factorization.

21010566610937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 21010566610937 in words is "twenty-one trillion, ten billion, five hundred sixty-six million, six hundred ten thousand, nine hundred thirty-seven".