12872021 has 2 divisors, whose sum is σ = 12872022. Its totient is φ = 12872020.

The previous prime is 12872003. The next prime is 12872029. The reversal of 12872021 is 12027821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7349521 + 5522500 = 2711^2 + 2350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12872021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12872029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6436010 + 6436011.

It is an arithmetic number, because the mean of its divisors is an integer number (6436011).

Almost surely, 2^12872021 is an apocalyptic number.

It is an amenable number.

12872021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12872021 is an equidigital number, since it uses as much as digits as its factorization.

12872021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12872021 is about 3587.7598860570. The cubic root of 12872021 is about 234.3593293463.

Adding to 12872021 its reverse (12027821), we get a palindrome (24899842).

The spelling of 12872021 in words is "twelve million, eight hundred seventy-two thousand, twenty-one".