21253236025237 has 2 divisors, whose sum is σ = 21253236025238. Its totient is φ = 21253236025236.

The previous prime is 21253236025207. The next prime is 21253236025309. The reversal of 21253236025237 is 73252063235212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17058436394596 + 4194799630641 = 4130186^2 + 2048121^2 .

It is a cyclic number.

It is not a de Polignac number, because 21253236025237 - 2¹⁹ = 21253235500949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21253236025193 and 21253236025202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21253236025207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626618012618 + 10626618012619.

It is an arithmetic number, because the mean of its divisors is an integer number (10626618012619).

Almost surely, 2^{21253236025237} is an apocalyptic number.

It is an amenable number.

21253236025237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253236025237 is an equidigital number, since it uses as much as digits as its factorization.

21253236025237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 43.

The spelling of 21253236025237 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirty-six million, twenty-five thousand, two hundred thirty-seven".