13077821 has 2 divisors, whose sum is σ = 13077822. Its totient is φ = 13077820.

The previous prime is 13077809. The next prime is 13077839. The reversal of 13077821 is 12877031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 81796 = 3605^2 + 286^2 .

It is an emirp because it is prime and its reverse (12877031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13077821 - 2¹⁰ = 13076797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13077221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6538910 + 6538911.

It is an arithmetic number, because the mean of its divisors is an integer number (6538911).

Almost surely, 2^13077821 is an apocalyptic number.

It is an amenable number.

13077821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13077821 is an equidigital number, since it uses as much as digits as its factorization.

13077821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 13077821 is about 3616.3270040194. The cubic root of 13077821 is about 235.6017233865.

The spelling of 13077821 in words is "thirteen million, seventy-seven thousand, eight hundred twenty-one".