12534421 has 2 divisors, whose sum is σ = 12534422. Its totient is φ = 12534420.

The previous prime is 12534367. The next prime is 12534443. The reversal of 12534421 is 12443521.

It is an a-pointer prime, because the next prime (12534443) can be obtained adding 12534421 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 2856100 = 3111^2 + 1690^2 .

It is an emirp because it is prime and its reverse (12443521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12534421 is a prime.

It is a super-2 number, since 2×12534421² = 314223419610482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12534392 and 12534401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12534461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6267210 + 6267211.

It is an arithmetic number, because the mean of its divisors is an integer number (6267211).

Almost surely, 2^12534421 is an apocalyptic number.

It is an amenable number.

12534421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12534421 is an equidigital number, since it uses as much as digits as its factorization.

12534421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 22.

The square root of 12534421 is about 3540.3984239066. The cubic root of 12534421 is about 232.2922706181.

Adding to 12534421 its reverse (12443521), we get a palindrome (24977942).

The spelling of 12534421 in words is "twelve million, five hundred thirty-four thousand, four hundred twenty-one".