13121204340 has 24 divisors (see below), whose sum is σ = 36739372320. Its totient is φ = 3498987808.

The previous prime is 13121204321. The next prime is 13121204347. The reversal of 13121204340 is 4340212131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121204347) 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, 109343310 + ... + 109343429.

It is an arithmetic number, because the mean of its divisors is an integer number (1530807180).

Almost surely, 2^13121204340 is an apocalyptic number.

13121204340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121204340 is an abundant number, since it is smaller than the sum of its proper divisors (23618167980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13121204340 is a wasteful number, since it uses less digits than its factorization.

13121204340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218686751 (or 218686749 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 13121204340 its reverse (4340212131), we get a palindrome (17461416471).

The spelling of 13121204340 in words is "thirteen billion, one hundred twenty-one million, two hundred four thousand, three hundred forty".