1365743021 has 2 divisors, whose sum is σ = 1365743022. Its totient is φ = 1365743020.

The previous prime is 1365742993. The next prime is 1365743063. The reversal of 1365743021 is 1203475631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140412900 + 225330121 = 33770^2 + 15011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1365743021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1365743521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682871510 + 682871511.

It is an arithmetic number, because the mean of its divisors is an integer number (682871511).

Almost surely, 2^1365743021 is an apocalyptic number.

It is an amenable number.

1365743021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365743021 is an equidigital number, since it uses as much as digits as its factorization.

1365743021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1365743021 is about 36955.9605611869. The cubic root of 1365743021 is about 1109.4889894122.

The spelling of 1365743021 in words is "one billion, three hundred sixty-five million, seven hundred forty-three thousand, twenty-one".