13077221 has 2 divisors, whose sum is σ = 13077222. Its totient is φ = 13077220.

The previous prime is 13077217. The next prime is 13077223. The reversal of 13077221 is 12277031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 474721 = 3550^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 13077221 - 2² = 13077217 is a prime.

Together with 13077223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13077223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6538610 + 6538611.

It is an arithmetic number, because the mean of its divisors is an integer number (6538611).

Almost surely, 2^13077221 is an apocalyptic number.

It is an amenable number.

13077221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13077221 is an equidigital number, since it uses as much as digits as its factorization.

13077221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 13077221 is about 3616.2440459681. The cubic root of 13077221 is about 235.5981202583.

The spelling of 13077221 in words is "thirteen million, seventy-seven thousand, two hundred twenty-one".