12451421 has 2 divisors, whose sum is σ = 12451422. Its totient is φ = 12451420.

The previous prime is 12451409. The next prime is 12451447. The reversal of 12451421 is 12415421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9084196 + 3367225 = 3014^2 + 1835^2 .

It is an emirp because it is prime and its reverse (12415421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12451421 - 2¹⁰ = 12450397 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12451393 and 12451402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12451921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6225710 + 6225711.

It is an arithmetic number, because the mean of its divisors is an integer number (6225711).

Almost surely, 2^12451421 is an apocalyptic number.

It is an amenable number.

12451421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12451421 is an equidigital number, since it uses as much as digits as its factorization.

12451421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 20.

The square root of 12451421 is about 3528.6571100066. The cubic root of 12451421 is about 231.7784063781.

Adding to 12451421 its reverse (12415421), we get a palindrome (24866842).

The spelling of 12451421 in words is "twelve million, four hundred fifty-one thousand, four hundred twenty-one".