12131421321 has 16 divisors (see below), whose sum is σ = 17069048640. Its totient is φ = 7642828800.

The previous prime is 12131421293. The next prime is 12131421347. The reversal of 12131421321 is 12312413121.

It is not a de Polignac number, because 12131421321 - 2⁶ = 12131421257 is a prime.

It is a super-2 number, since 2×12131421321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12131421521) 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, 242520 + ... + 288233.

It is an arithmetic number, because the mean of its divisors is an integer number (1066815540).

Almost surely, 2^12131421321 is an apocalyptic number.

It is an amenable number.

12131421321 is a deficient number, since it is larger than the sum of its proper divisors (4937627319).

12131421321 is a wasteful number, since it uses less digits than its factorization.

12131421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531176.

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

Adding to 12131421321 its reverse (12312413121), we get a palindrome (24443834442).

The spelling of 12131421321 in words is "twelve billion, one hundred thirty-one million, four hundred twenty-one thousand, three hundred twenty-one".