12026421 has 16 divisors (see below), whose sum is σ = 19437120. Its totient is φ = 7288560.

The previous prime is 12026381. The next prime is 12026423. The reversal of 12026421 is 12462021.

12026421 is a `hidden beast` number, since 1 + 20 + 2 + 642 + 1 = 666.

12026421 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12026421 - 2¹⁰ = 12025397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12026394 and 12026403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12026423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19950 + ... + 20543.

It is an arithmetic number, because the mean of its divisors is an integer number (1214820).

Almost surely, 2^12026421 is an apocalyptic number.

12026421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12026421 is a deficient number, since it is larger than the sum of its proper divisors (7410699).

12026421 is a wasteful number, since it uses less digits than its factorization.

12026421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40513 (or 40507 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12026421 is about 3467.9130611940. The cubic root of 12026421 is about 229.1107503172.

Adding to 12026421 its reverse (12462021), we get a palindrome (24488442).

Subtracting 12026421 from its reverse (12462021), we obtain a square (435600 = 660²).

The spelling of 12026421 in words is "twelve million, twenty-six thousand, four hundred twenty-one".