21306482537 has 2 divisors, whose sum is σ = 21306482538. Its totient is φ = 21306482536.

The previous prime is 21306482473. The next prime is 21306482543. The reversal of 21306482537 is 73528460312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16194089536 + 5112393001 = 127256^2 + 71501^2 .

It is a cyclic number.

It is not a de Polignac number, because 21306482537 - 2⁶ = 21306482473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21306482494 and 21306482503.

It is not a weakly prime, because it can be changed into another prime (21306482567) 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, 10653241268 + 10653241269.

It is an arithmetic number, because the mean of its divisors is an integer number (10653241269).

Almost surely, 2^21306482537 is an apocalyptic number.

It is an amenable number.

21306482537 is a deficient number, since it is larger than the sum of its proper divisors (1).

21306482537 is an equidigital number, since it uses as much as digits as its factorization.

21306482537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 21306482537 in words is "twenty-one billion, three hundred six million, four hundred eighty-two thousand, five hundred thirty-seven".