13140821 has 2 divisors, whose sum is σ = 13140822. Its totient is φ = 13140820.

The previous prime is 13140773. The next prime is 13140833. The reversal of 13140821 is 12804131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13140625 + 196 = 3625^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 13140821 - 2¹⁴ = 13124437 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 13140793 and 13140802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13140851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6570410 + 6570411.

It is an arithmetic number, because the mean of its divisors is an integer number (6570411).

Almost surely, 2^13140821 is an apocalyptic number.

It is an amenable number.

13140821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13140821 is an equidigital number, since it uses as much as digits as its factorization.

13140821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 13140821 is about 3625.0270343820. The cubic root of 13140821 is about 235.9794401796.

Adding to 13140821 its reverse (12804131), we get a palindrome (25944952).

The spelling of 13140821 in words is "thirteen million, one hundred forty thousand, eight hundred twenty-one".