11844021 has 12 divisors (see below), whose sum is σ = 18072096. Its totient is φ = 6759000.

The previous prime is 11843999. The next prime is 11844029. The reversal of 11844021 is 12044811.

It is a happy number.

It is not a de Polignac number, because 11844021 - 2¹⁵ = 11811253 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11844029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15396 + ... + 16146.

It is an arithmetic number, because the mean of its divisors is an integer number (1506008).

Almost surely, 2^11844021 is an apocalyptic number.

It is an amenable number.

11844021 is a deficient number, since it is larger than the sum of its proper divisors (6228075).

11844021 is an frugal number, since it uses more digits than its factorization.

11844021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 11844021 is about 3441.5143469118. The cubic root of 11844021 is about 227.9465671956.

Multiplying 11844021 by its sum of digits (21), we get a square (248724441 = 15771²).

11844021 divided by its sum of digits (21) gives a square (564001 = 751²).

Adding to 11844021 its reverse (12044811), we get a palindrome (23888832).

The spelling of 11844021 in words is "eleven million, eight hundred forty-four thousand, twenty-one".