12039021 has 12 divisors (see below), whose sum is σ = 17675580. Its totient is φ = 7894080.

The previous prime is 12039007. The next prime is 12039059. The reversal of 12039021 is 12093021.

It is a happy number.

12039021 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 5336100 = 2589^2 + 2310^2 .

It is not a de Polignac number, because 12039021 - 2¹⁰ = 12037997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12038985 and 12039003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12039061) 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, 10416 + ... + 11513.

It is an arithmetic number, because the mean of its divisors is an integer number (1472965).

Almost surely, 2^12039021 is an apocalyptic number.

It is an amenable number.

12039021 is a deficient number, since it is larger than the sum of its proper divisors (5636559).

12039021 is a wasteful number, since it uses less digits than its factorization.

12039021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21996 (or 21993 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 12039021 is about 3469.7292401569. The cubic root of 12039021 is about 229.1907349854.

The spelling of 12039021 in words is "twelve million, thirty-nine thousand, twenty-one".