1366421213 has 2 divisors, whose sum is σ = 1366421214. Its totient is φ = 1366421212.

The previous prime is 1366421201. The next prime is 1366421261. The reversal of 1366421213 is 3121246631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 711982489 + 654438724 = 26683^2 + 25582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366421213 - 2¹⁴ = 1366404829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366421263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683210606 + 683210607.

It is an arithmetic number, because the mean of its divisors is an integer number (683210607).

Almost surely, 2^1366421213 is an apocalyptic number.

It is an amenable number.

1366421213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366421213 is an equidigital number, since it uses as much as digits as its factorization.

1366421213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 1366421213 is about 36965.1351005241. The cubic root of 1366421213 is about 1109.6726066890.

Adding to 1366421213 its reverse (3121246631), we get a palindrome (4487667844).

The spelling of 1366421213 in words is "one billion, three hundred sixty-six million, four hundred twenty-one thousand, two hundred thirteen".