12821437 has 2 divisors, whose sum is σ = 12821438. Its totient is φ = 12821436.

The previous prime is 12821423. The next prime is 12821449. The reversal of 12821437 is 73412821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12773476 + 47961 = 3574^2 + 219^2 .

It is a cyclic number.

It is not a de Polignac number, because 12821437 - 2¹⁵ = 12788669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12821477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410718 + 6410719.

It is an arithmetic number, because the mean of its divisors is an integer number (6410719).

Almost surely, 2^12821437 is an apocalyptic number.

It is an amenable number.

12821437 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821437 is an equidigital number, since it uses as much as digits as its factorization.

12821437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 12821437 is about 3580.7034225135. The cubic root of 12821437 is about 234.0519340740.

The spelling of 12821437 in words is "twelve million, eight hundred twenty-one thousand, four hundred thirty-seven".