13012421 has 4 divisors (see below), whose sum is σ = 13021932. Its totient is φ = 13002912.

The previous prime is 13012409. The next prime is 13012427. The reversal of 13012421 is 12421031.

13012421 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12421031 = 7 ⋅1774433.

It can be written as a sum of positive squares in 2 ways, for example, as 1716100 + 11296321 = 1310^2 + 3361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13012421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13012396 and 13012405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13012427) 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, 2270 + ... + 5583.

It is an arithmetic number, because the mean of its divisors is an integer number (3255483).

Almost surely, 2^13012421 is an apocalyptic number.

It is an amenable number.

13012421 is a deficient number, since it is larger than the sum of its proper divisors (9511).

13012421 is an equidigital number, since it uses as much as digits as its factorization.

13012421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9510.

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

The square root of 13012421 is about 3607.2733470032. The cubic root of 13012421 is about 235.2083319295.

Adding to 13012421 its reverse (12421031), we get a palindrome (25433452).

The spelling of 13012421 in words is "thirteen million, twelve thousand, four hundred twenty-one".