13431210121 has 16 divisors (see below), whose sum is σ = 15694560000. Its totient is φ = 11489430624.

The previous prime is 13431210119. The next prime is 13431210137. The reversal of 13431210121 is 12101213431.

It is not a de Polignac number, because 13431210121 - 2¹ = 13431210119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13431210101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133605 + ... + 211453.

It is an arithmetic number, because the mean of its divisors is an integer number (980910000).

Almost surely, 2^13431210121 is an apocalyptic number.

It is an amenable number.

13431210121 is a deficient number, since it is larger than the sum of its proper divisors (2263349879).

13431210121 is an frugal number, since it uses more digits than its factorization.

13431210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78373 (or 78359 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 13431210121 its reverse (12101213431), we get a palindrome (25532423552).

The spelling of 13431210121 in words is "thirteen billion, four hundred thirty-one million, two hundred ten thousand, one hundred twenty-one".