12851287021 has 2 divisors, whose sum is σ = 12851287022. Its totient is φ = 12851287020.

The previous prime is 12851286949. The next prime is 12851287039. The reversal of 12851287021 is 12078215821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12699036100 + 152250921 = 112690^2 + 12339^2 .

It is a cyclic number.

It is not a de Polignac number, because 12851287021 - 2¹⁵ = 12851254253 is a prime.

It is a super-2 number, since 2×12851287021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12851287081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6425643510 + 6425643511.

It is an arithmetic number, because the mean of its divisors is an integer number (6425643511).

Almost surely, 2^12851287021 is an apocalyptic number.

It is an amenable number.

12851287021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12851287021 is an equidigital number, since it uses as much as digits as its factorization.

12851287021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 37.

The spelling of 12851287021 in words is "twelve billion, eight hundred fifty-one million, two hundred eighty-seven thousand, twenty-one".