21375171636037 has 2 divisors, whose sum is σ = 21375171636038. Its totient is φ = 21375171636036.

The previous prime is 21375171636011. The next prime is 21375171636073. The reversal of 21375171636037 is 73063617157312.

Together with next prime (21375171636073) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21366128767201 + 9042868836 = 4622351^2 + 95094^2 .

It is a cyclic number.

It is not a de Polignac number, because 21375171636037 - 2¹¹ = 21375171633989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21375171636337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687585818018 + 10687585818019.

It is an arithmetic number, because the mean of its divisors is an integer number (10687585818019).

Almost surely, 2^{21375171636037} is an apocalyptic number.

It is an amenable number.

21375171636037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21375171636037 is an equidigital number, since it uses as much as digits as its factorization.

21375171636037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3333960, while the sum is 52.

The spelling of 21375171636037 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-one million, six hundred thirty-six thousand, thirty-seven".