13551541021 has 2 divisors, whose sum is σ = 13551541022. Its totient is φ = 13551541020.

The previous prime is 13551541013. The next prime is 13551541033. The reversal of 13551541021 is 12014515531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8820027225 + 4731513796 = 93915^2 + 68786^2 .

It is a cyclic number.

It is not a de Polignac number, because 13551541021 - 2³ = 13551541013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13551541121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6775770510 + 6775770511.

It is an arithmetic number, because the mean of its divisors is an integer number (6775770511).

Almost surely, 2^13551541021 is an apocalyptic number.

It is an amenable number.

13551541021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13551541021 is an equidigital number, since it uses as much as digits as its factorization.

13551541021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 13551541021 in words is "thirteen billion, five hundred fifty-one million, five hundred forty-one thousand, twenty-one".