12403021 has 4 divisors (see below), whose sum is σ = 12493692. Its totient is φ = 12312352.

The previous prime is 12403019. The next prime is 12403031. The reversal of 12403021 is 12030421.

12403021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2706025 + 9696996 = 1645^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12403021 - 2¹ = 12403019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12402992 and 12403010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12403031) 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, 45130 + ... + 45403.

It is an arithmetic number, because the mean of its divisors is an integer number (3123423).

Almost surely, 2^12403021 is an apocalyptic number.

It is an amenable number.

12403021 is a deficient number, since it is larger than the sum of its proper divisors (90671).

12403021 is an equidigital number, since it uses as much as digits as its factorization.

12403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90670.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 12403021 is about 3521.7922993839. The cubic root of 12403021 is about 231.4777006294.

Adding to 12403021 its reverse (12030421), we get a palindrome (24433442).

The spelling of 12403021 in words is "twelve million, four hundred three thousand, twenty-one".