13281812121 has 8 divisors (see below), whose sum is σ = 17738551264. Its totient is φ = 8839807200.

The previous prime is 13281812119. The next prime is 13281812177. The reversal of 13281812121 is 12121818231.

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

It is not a de Polignac number, because 13281812121 - 2¹ = 13281812119 is a prime.

It is a super-3 number, since 3×13281812121³ (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 (13281812101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3681451 + ... + 3685056.

It is an arithmetic number, because the mean of its divisors is an integer number (2217318908).

Almost surely, 2^13281812121 is an apocalyptic number.

It is an amenable number.

13281812121 is a deficient number, since it is larger than the sum of its proper divisors (4456739143).

13281812121 is an equidigital number, since it uses as much as digits as its factorization.

13281812121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7367111.

The product of its digits is 1536, while the sum is 30.

The spelling of 13281812121 in words is "thirteen billion, two hundred eighty-one million, eight hundred twelve thousand, one hundred twenty-one".