13201087478921 has 8 divisors (see below), whose sum is σ = 13204263699144. Its totient is φ = 13197911478400.

The previous prime is 13201087478893. The next prime is 13201087478927. The reversal of 13201087478921 is 12987478010231.

It can be written as a sum of positive squares in 4 ways, for example, as 888259125625 + 12312828353296 = 942475^2 + 3508964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13201087478921 - 2²² = 13201083284617 is a prime.

It is a super-2 number, since 2×13201087478921² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13201087478927) 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 in 7 ways as a sum of consecutive naturals, for example, 212201621 + ... + 212263821.

It is an arithmetic number, because the mean of its divisors is an integer number (1650532962393).

Almost surely, 2^{13201087478921} is an apocalyptic number.

It is an amenable number.

13201087478921 is a deficient number, since it is larger than the sum of its proper divisors (3176220223).

13201087478921 is an equidigital number, since it uses as much as digits as its factorization.

13201087478921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109851.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 13201087478921 in words is "thirteen trillion, two hundred one billion, eighty-seven million, four hundred seventy-eight thousand, nine hundred twenty-one".