11436021 has 6 divisors (see below), whose sum is σ = 16518710. Its totient is φ = 7624008.

The previous prime is 11436013. The next prime is 11436023. The reversal of 11436021 is 12063411.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7784100 + 3651921 = 2790^2 + 1911^2 .

It is not a de Polignac number, because 11436021 - 2³ = 11436013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11435985 and 11436003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11436023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 635326 + ... + 635343.

Almost surely, 2^11436021 is an apocalyptic number.

It is an amenable number.

11436021 is a deficient number, since it is larger than the sum of its proper divisors (5082689).

11436021 is a wasteful number, since it uses less digits than its factorization.

11436021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270675 (or 1270672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 11436021 is about 3381.7186458959. The cubic root of 11436021 is about 225.2985074987.

Adding to 11436021 its reverse (12063411), we get a palindrome (23499432).

The spelling of 11436021 in words is "eleven million, four hundred thirty-six thousand, twenty-one".