13478003521 has 2 divisors, whose sum is σ = 13478003522. Its totient is φ = 13478003520.

The previous prime is 13478003467. The next prime is 13478003537. The reversal of 13478003521 is 12530087431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13367984400 + 110019121 = 115620^2 + 10489^2 .

It is a cyclic number.

It is not a de Polignac number, because 13478003521 - 2²¹ = 13475906369 is a prime.

It is not a weakly prime, because it can be changed into another prime (13478003621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6739001760 + 6739001761.

It is an arithmetic number, because the mean of its divisors is an integer number (6739001761).

Almost surely, 2^13478003521 is an apocalyptic number.

It is an amenable number.

13478003521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13478003521 is an equidigital number, since it uses as much as digits as its factorization.

13478003521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 13478003521 in words is "thirteen billion, four hundred seventy-eight million, three thousand, five hundred twenty-one".