11923021 has 4 divisors (see below), whose sum is σ = 13006944. Its totient is φ = 10839100.

The previous prime is 11923019. The next prime is 11923057. The reversal of 11923021 is 12032911.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12032911 = 11 ⋅1093901.

It is a cyclic number.

It is not a de Polignac number, because 11923021 - 2¹ = 11923019 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 11923021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11923081) 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, 541945 + ... + 541966.

It is an arithmetic number, because the mean of its divisors is an integer number (3251736).

Almost surely, 2^11923021 is an apocalyptic number.

11923021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11923021 is a deficient number, since it is larger than the sum of its proper divisors (1083923).

11923021 is a wasteful number, since it uses less digits than its factorization.

11923021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083922.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 11923021 is about 3452.9727771878. The cubic root of 11923021 is about 228.4522481921.

Adding to 11923021 its reverse (12032911), we get a palindrome (23955932).

The spelling of 11923021 in words is "eleven million, nine hundred twenty-three thousand, twenty-one".