1306036021 has 4 divisors (see below), whose sum is σ = 1306526572. Its totient is φ = 1305545472.

The previous prime is 1306035971. The next prime is 1306036037. The reversal of 1306036021 is 1206306031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102292996 + 1203743025 = 10114^2 + 34695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1306036021 - 2⁷ = 1306035893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1306035983 and 1306036001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306036051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241260 + ... + 246613.

It is an arithmetic number, because the mean of its divisors is an integer number (326631643).

Almost surely, 2^1306036021 is an apocalyptic number.

It is an amenable number.

1306036021 is a deficient number, since it is larger than the sum of its proper divisors (490551).

1306036021 is an equidigital number, since it uses as much as digits as its factorization.

1306036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490550.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1306036021 is about 36139.1203683764. The cubic root of 1306036021 is about 1093.0794217426.

The spelling of 1306036021 in words is "one billion, three hundred six million, thirty-six thousand, twenty-one".