13603811021 has 2 divisors, whose sum is σ = 13603811022. Its totient is φ = 13603811020.

The previous prime is 13603810993. The next prime is 13603811027. The reversal of 13603811021 is 12011830631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12213565225 + 1390245796 = 110515^2 + 37286^2 .

It is a cyclic number.

It is not a de Polignac number, because 13603811021 - 2¹⁰ = 13603809997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13603811027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6801905510 + 6801905511.

It is an arithmetic number, because the mean of its divisors is an integer number (6801905511).

Almost surely, 2^13603811021 is an apocalyptic number.

It is an amenable number.

13603811021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13603811021 is an equidigital number, since it uses as much as digits as its factorization.

13603811021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 13603811021 in words is "thirteen billion, six hundred three million, eight hundred eleven thousand, twenty-one".