13139669814521 has 4 divisors (see below), whose sum is σ = 13287306554100. Its totient is φ = 12992033074944.

The previous prime is 13139669814499. The next prime is 13139669814527. The reversal of 13139669814521 is 12541896693131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2063420204521 + 11076249610000 = 1436461^2 + 3328100^2 .

It is a cyclic number.

It is not a de Polignac number, because 13139669814521 - 2⁶ = 13139669814457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13139669814527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73818369656 + ... + 73818369833.

It is an arithmetic number, because the mean of its divisors is an integer number (3321826638525).

Almost surely, 2^{13139669814521} is an apocalyptic number.

It is an amenable number.

13139669814521 is a deficient number, since it is larger than the sum of its proper divisors (147636739579).

13139669814521 is an equidigital number, since it uses as much as digits as its factorization.

13139669814521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147636739578.

The product of its digits is 8398080, while the sum is 59.

The spelling of 13139669814521 in words is "thirteen trillion, one hundred thirty-nine billion, six hundred sixty-nine million, eight hundred fourteen thousand, five hundred twenty-one".