13212134121 has 4 divisors (see below), whose sum is σ = 17616178832. Its totient is φ = 8808089412.

The previous prime is 13212134113. The next prime is 13212134129. The reversal of 13212134121 is 12143121231.

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 an interprime number because it is at equal distance from previous prime (13212134113) and next prime (13212134129).

It is not a de Polignac number, because 13212134121 - 2³ = 13212134113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13212134129) 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, 2202022351 + ... + 2202022356.

It is an arithmetic number, because the mean of its divisors is an integer number (4404044708).

Almost surely, 2^13212134121 is an apocalyptic number.

It is an amenable number.

13212134121 is a deficient number, since it is larger than the sum of its proper divisors (4404044711).

13212134121 is an equidigital number, since it uses as much as digits as its factorization.

13212134121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404044710.

The product of its digits is 288, while the sum is 21.

Adding to 13212134121 its reverse (12143121231), we get a palindrome (25355255352).

The spelling of 13212134121 in words is "thirteen billion, two hundred twelve million, one hundred thirty-four thousand, one hundred twenty-one".