12877821 has 12 divisors (see below), whose sum is σ = 20292480. Its totient is φ = 7804680.

The previous prime is 12877807. The next prime is 12877831.

It is a happy number.

12877821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12877821 - 2⁶ = 12877757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12877831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64941 + ... + 65138.

It is an arithmetic number, because the mean of its divisors is an integer number (1691040).

Almost surely, 2^12877821 is an apocalyptic number.

12877821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12877821 is a deficient number, since it is larger than the sum of its proper divisors (7414659).

12877821 is a wasteful number, since it uses less digits than its factorization.

12877821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130096 (or 130093 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 12877821 is about 3588.5680988383. The cubic root of 12877821 is about 234.3945240269.

The spelling of 12877821 in words is "twelve million, eight hundred seventy-seven thousand, eight hundred twenty-one".