21204102037 has 2 divisors, whose sum is σ = 21204102038. Its totient is φ = 21204102036.

The previous prime is 21204102019. The next prime is 21204102071. The reversal of 21204102037 is 73020140212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18990493636 + 2213608401 = 137806^2 + 47049^2 .

It is a cyclic number.

It is not a de Polignac number, because 21204102037 - 2¹⁵ = 21204069269 is a prime.

It is a super-2 number, since 2×21204102037² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21204101999 and 21204102017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21204102077) 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, 10602051018 + 10602051019.

It is an arithmetic number, because the mean of its divisors is an integer number (10602051019).

Almost surely, 2^21204102037 is an apocalyptic number.

It is an amenable number.

21204102037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204102037 is an equidigital number, since it uses as much as digits as its factorization.

21204102037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21204102037 its reverse (73020140212), we get a palindrome (94224242249).

The spelling of 21204102037 in words is "twenty-one billion, two hundred four million, one hundred two thousand, thirty-seven".