13435216121 has 4 divisors (see below), whose sum is σ = 13436644752. Its totient is φ = 13433787492.

The previous prime is 13435216099. The next prime is 13435216153. The reversal of 13435216121 is 12161253431.

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.

It is a cyclic number.

It is not a de Polignac number, because 13435216121 - 2⁶ = 13435216057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13435216621) 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, 700115 + ... + 719048.

It is an arithmetic number, because the mean of its divisors is an integer number (3359161188).

Almost surely, 2^13435216121 is an apocalyptic number.

It is an amenable number.

13435216121 is a deficient number, since it is larger than the sum of its proper divisors (1428631).

13435216121 is an equidigital number, since it uses as much as digits as its factorization.

13435216121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428630.

The product of its digits is 4320, while the sum is 29.

Adding to 13435216121 its reverse (12161253431), we get a palindrome (25596469552).

The spelling of 13435216121 in words is "thirteen billion, four hundred thirty-five million, two hundred sixteen thousand, one hundred twenty-one".