11516421 has 24 divisors (see below), whose sum is σ = 18012000. Its totient is φ = 6525792.

The previous prime is 11516419. The next prime is 11516441. The reversal of 11516421 is 12461511.

It is not a de Polignac number, because 11516421 - 2¹ = 11516419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11516441) 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 23 ways as a sum of consecutive naturals, for example, 22830 + ... + 23328.

It is an arithmetic number, because the mean of its divisors is an integer number (750500).

Almost surely, 2^11516421 is an apocalyptic number.

It is an amenable number.

11516421 is a deficient number, since it is larger than the sum of its proper divisors (6495579).

11516421 is a wasteful number, since it uses less digits than its factorization.

11516421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 666 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 11516421 is about 3393.5852722453. The cubic root of 11516421 is about 225.8252558426.

Adding to 11516421 its reverse (12461511), we get a palindrome (23977932).

The spelling of 11516421 in words is "eleven million, five hundred sixteen thousand, four hundred twenty-one".