12659021 has 2 divisors, whose sum is σ = 12659022. Its totient is φ = 12659020.

The previous prime is 12659011. The next prime is 12659029. The reversal of 12659021 is 12095621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8934121 + 3724900 = 2989^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 12659021 - 2⁶ = 12658957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12659029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6329510 + 6329511.

It is an arithmetic number, because the mean of its divisors is an integer number (6329511).

Almost surely, 2^12659021 is an apocalyptic number.

It is an amenable number.

12659021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12659021 is an equidigital number, since it uses as much as digits as its factorization.

12659021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 12659021 is about 3557.9517984368. The cubic root of 12659021 is about 233.0594443919.

The spelling of 12659021 in words is "twelve million, six hundred fifty-nine thousand, twenty-one".