12013421 has 4 divisors (see below), whose sum is σ = 13729632. Its totient is φ = 10297212.

The previous prime is 12013411. The next prime is 12013427. The reversal of 12013421 is 12431021.

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: 12431021 = 241 ⋅51581.

It is a cyclic number.

It is not a de Polignac number, because 12013421 - 2¹⁸ = 11751277 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12013396 and 12013405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013427) 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, 858095 + ... + 858108.

It is an arithmetic number, because the mean of its divisors is an integer number (3432408).

Almost surely, 2^12013421 is an apocalyptic number.

It is an amenable number.

12013421 is a deficient number, since it is larger than the sum of its proper divisors (1716211).

12013421 is an equidigital number, since it uses as much as digits as its factorization.

12013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716210.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 12013421 is about 3466.0382282947. The cubic root of 12013421 is about 229.0281678769.

Adding to 12013421 its reverse (12431021), we get a palindrome (24444442).

The spelling of 12013421 in words is "twelve million, thirteen thousand, four hundred twenty-one".