12131421 has 16 divisors (see below), whose sum is σ = 17270784. Its totient is φ = 7547904.

The previous prime is 12131417. The next prime is 12131429. The reversal of 12131421 is 12413121.

It is not a de Polignac number, because 12131421 - 2² = 12131417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12131421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5541 + ... + 7413.

It is an arithmetic number, because the mean of its divisors is an integer number (1079424).

Almost surely, 2^12131421 is an apocalyptic number.

It is an amenable number.

12131421 is a deficient number, since it is larger than the sum of its proper divisors (5139363).

12131421 is a wasteful number, since it uses less digits than its factorization.

12131421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its digits is 48, while the sum is 15.

The square root of 12131421 is about 3483.0189491302. The cubic root of 12131421 is about 229.7755908208.

Adding to 12131421 its reverse (12413121), we get a palindrome (24544542).

The spelling of 12131421 in words is "twelve million, one hundred thirty-one thousand, four hundred twenty-one".