21032030237 has 2 divisors, whose sum is σ = 21032030238. Its totient is φ = 21032030236.

The previous prime is 21032030177. The next prime is 21032030281. The reversal of 21032030237 is 73203023012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18763794361 + 2268235876 = 136981^2 + 47626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21032030237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21032000237) 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, 10516015118 + 10516015119.

It is an arithmetic number, because the mean of its divisors is an integer number (10516015119).

Almost surely, 2^21032030237 is an apocalyptic number.

It is an amenable number.

21032030237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21032030237 is an equidigital number, since it uses as much as digits as its factorization.

21032030237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 23.

Adding to 21032030237 its reverse (73203023012), we get a palindrome (94235053249).

The spelling of 21032030237 in words is "twenty-one billion, thirty-two million, thirty thousand, two hundred thirty-seven".