12977021 has 4 divisors (see below), whose sum is σ = 12984252. Its totient is φ = 12969792.

The previous prime is 12977017. The next prime is 12977023. The reversal of 12977021 is 12077921.

12977021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12077921 = 23 ⋅525127.

It can be written as a sum of positive squares in 2 ways, for example, as 11323225 + 1653796 = 3365^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 12977021 - 2² = 12977017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12977023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (3246063).

Almost surely, 2^12977021 is an apocalyptic number.

It is an amenable number.

12977021 is a deficient number, since it is larger than the sum of its proper divisors (7231).

12977021 is an equidigital number, since it uses as much as digits as its factorization.

12977021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7230.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 12977021 is about 3602.3632520888. The cubic root of 12977021 is about 234.9948452166.

The spelling of 12977021 in words is "twelve million, nine hundred seventy-seven thousand, twenty-one".