12821377 has 2 divisors, whose sum is σ = 12821378. Its totient is φ = 12821376.

The previous prime is 12821359. The next prime is 12821381. The reversal of 12821377 is 77312821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8785296 + 4036081 = 2964^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 12821377 - 2¹¹ = 12819329 is a prime.

It is a super-2 number, since 2×12821377² = 328775416352258, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12821317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410688 + 6410689.

It is an arithmetic number, because the mean of its divisors is an integer number (6410689).

Almost surely, 2^12821377 is an apocalyptic number.

It is an amenable number.

12821377 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821377 is an equidigital number, since it uses as much as digits as its factorization.

12821377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4704, while the sum is 31.

The square root of 12821377 is about 3580.6950442617. The cubic root of 12821377 is about 234.0515689787.

The spelling of 12821377 in words is "twelve million, eight hundred twenty-one thousand, three hundred seventy-seven".