13658872021 has 2 divisors, whose sum is σ = 13658872022. Its totient is φ = 13658872020.

The previous prime is 13658872001. The next prime is 13658872033. The reversal of 13658872021 is 12027885631.

13658872021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11703994225 + 1954877796 = 108185^2 + 44214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13658872021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13658872001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6829436010 + 6829436011.

It is an arithmetic number, because the mean of its divisors is an integer number (6829436011).

Almost surely, 2^13658872021 is an apocalyptic number.

It is an amenable number.

13658872021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13658872021 is an equidigital number, since it uses as much as digits as its factorization.

13658872021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 13658872021 in words is "thirteen billion, six hundred fifty-eight million, eight hundred seventy-two thousand, twenty-one".