11431421 has 4 divisors (see below), whose sum is σ = 11697312. Its totient is φ = 11165532.

The previous prime is 11431403. The next prime is 11431447. The reversal of 11431421 is 12413411.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11431421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11431421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11431471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132881 + ... + 132966.

It is an arithmetic number, because the mean of its divisors is an integer number (2924328).

Almost surely, 2^11431421 is an apocalyptic number.

It is an amenable number.

11431421 is a deficient number, since it is larger than the sum of its proper divisors (265891).

11431421 is an equidigital number, since it uses as much as digits as its factorization.

11431421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265890.

The product of its digits is 96, while the sum is 17.

The square root of 11431421 is about 3381.0384499440. The cubic root of 11431421 is about 225.2682955884.

Adding to 11431421 its reverse (12413411), we get a palindrome (23844832).

The spelling of 11431421 in words is "eleven million, four hundred thirty-one thousand, four hundred twenty-one".