13540325921 has 4 divisors (see below), whose sum is σ = 13540562112. Its totient is φ = 13540089732.

The previous prime is 13540325893. The next prime is 13540325947. The reversal of 13540325921 is 12952304531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12952304531 = 17551 ⋅737981.

It is a cyclic number.

It is not a de Polignac number, because 13540325921 - 2²⁶ = 13473217057 is a prime.

It is a super-3 number, since 3×13540325921³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13540325021) 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, 28820 + ... + 167066.

It is an arithmetic number, because the mean of its divisors is an integer number (3385140528).

Almost surely, 2^13540325921 is an apocalyptic number.

It is an amenable number.

13540325921 is a deficient number, since it is larger than the sum of its proper divisors (236191).

13540325921 is an equidigital number, since it uses as much as digits as its factorization.

13540325921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236190.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 13540325921 in words is "thirteen billion, five hundred forty million, three hundred twenty-five thousand, nine hundred twenty-one".