21320032037 has 2 divisors, whose sum is σ = 21320032038. Its totient is φ = 21320032036.

The previous prime is 21320032007. The next prime is 21320032043. The reversal of 21320032037 is 73023002312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14438665921 + 6881366116 = 120161^2 + 82954^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320032037 - 2¹⁰ = 21320031013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320032007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660016018 + 10660016019.

It is an arithmetic number, because the mean of its divisors is an integer number (10660016019).

Almost surely, 2^21320032037 is an apocalyptic number.

It is an amenable number.

21320032037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320032037 is an equidigital number, since it uses as much as digits as its factorization.

21320032037 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 21320032037 its reverse (73023002312), we get a palindrome (94343034349).

The spelling of 21320032037 in words is "twenty-one billion, three hundred twenty million, thirty-two thousand, thirty-seven".