20013124203251 has 2 divisors, whose sum is σ = 20013124203252. Its totient is φ = 20013124203250.

The previous prime is 20013124203197. The next prime is 20013124203271. The reversal of 20013124203251 is 15230242131002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20013124203251 - 2⁶ = 20013124203187 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20013124203251.

It is not a weakly prime, because it can be changed into another prime (20013124203271) 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, 10006562101625 + 10006562101626.

It is an arithmetic number, because the mean of its divisors is an integer number (10006562101626).

Almost surely, 2^{20013124203251} is an apocalyptic number.

20013124203251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013124203251 is an equidigital number, since it uses as much as digits as its factorization.

20013124203251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20013124203251 its reverse (15230242131002), we get a palindrome (35243366334253).

The spelling of 20013124203251 in words is "twenty trillion, thirteen billion, one hundred twenty-four million, two hundred three thousand, two hundred fifty-one".