3605005021 has 2 divisors, whose sum is σ = 3605005022. Its totient is φ = 3605005020.

The previous prime is 3605005013. The next prime is 3605005031. The reversal of 3605005021 is 1205005063.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2264712921 + 1340292100 = 47589^2 + 36610^2 .

It is an emirp because it is prime and its reverse (1205005063) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3605005021 - 2³ = 3605005013 is a prime.

It is a super-2 number, since 2×3605005021² = 25992122402870420882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3605004983 and 3605005001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3605005031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1802502510 + 1802502511.

It is an arithmetic number, because the mean of its divisors is an integer number (1802502511).

Almost surely, 2^3605005021 is an apocalyptic number.

It is an amenable number.

3605005021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3605005021 is an equidigital number, since it uses as much as digits as its factorization.

3605005021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 3605005021 is about 60041.6940217379. The cubic root of 3605005021 is about 1533.3287941842.

The spelling of 3605005021 in words is "three billion, six hundred five million, five thousand, twenty-one".