21010115237 has 2 divisors, whose sum is σ = 21010115238. Its totient is φ = 21010115236.

The previous prime is 21010115221. The next prime is 21010115239. The reversal of 21010115237 is 73251101012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13661168161 + 7348947076 = 116881^2 + 85726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010115237 - 2⁴ = 21010115221 is a prime.

Together with 21010115239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010115239) 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, 10505057618 + 10505057619.

It is an arithmetic number, because the mean of its divisors is an integer number (10505057619).

Almost surely, 2^21010115237 is an apocalyptic number.

It is an amenable number.

21010115237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010115237 is an equidigital number, since it uses as much as digits as its factorization.

21010115237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

Adding to 21010115237 its reverse (73251101012), we get a palindrome (94261216249).

The spelling of 21010115237 in words is "twenty-one billion, ten million, one hundred fifteen thousand, two hundred thirty-seven".