11512421 has 4 divisors (see below), whose sum is σ = 11519244. Its totient is φ = 11505600.

The previous prime is 11512399. The next prime is 11512427. The reversal of 11512421 is 12421511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12421511 = 277 ⋅44843.

It can be written as a sum of positive squares in 2 ways, for example, as 8584900 + 2927521 = 2930^2 + 1711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11512421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11512421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (2879811).

Almost surely, 2^11512421 is an apocalyptic number.

It is an amenable number.

11512421 is a deficient number, since it is larger than the sum of its proper divisors (6823).

11512421 is an equidigital number, since it uses as much as digits as its factorization.

11512421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822.

The product of its digits is 80, while the sum is 17.

The square root of 11512421 is about 3392.9958738554. The cubic root of 11512421 is about 225.7991075099.

Adding to 11512421 its reverse (12421511), we get a palindrome (23933932).

The spelling of 11512421 in words is "eleven million, five hundred twelve thousand, four hundred twenty-one".