1366424242021 has 2 divisors, whose sum is σ = 1366424242022. Its totient is φ = 1366424242020.

The previous prime is 1366424241983. The next prime is 1366424242037. The reversal of 1366424242021 is 1202424246631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 961603816996 + 404820425025 = 980614^2 + 636255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1366424242021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366424242121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683212121010 + 683212121011.

It is an arithmetic number, because the mean of its divisors is an integer number (683212121011).

Almost surely, 2^{1366424242021} is an apocalyptic number.

It is an amenable number.

1366424242021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366424242021 is an equidigital number, since it uses as much as digits as its factorization.

1366424242021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 37.

Adding to 1366424242021 its reverse (1202424246631), we get a palindrome (2568848488652).

The spelling of 1366424242021 in words is "one trillion, three hundred sixty-six billion, four hundred twenty-four million, two hundred forty-two thousand, twenty-one".