3685202021 has 2 divisors, whose sum is σ = 3685202022. Its totient is φ = 3685202020.

The previous prime is 3685201969. The next prime is 3685202051. The reversal of 3685202021 is 1202025863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3476399521 + 208802500 = 58961^2 + 14450^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685202021 - 2¹⁰ = 3685200997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3685202051) 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, 1842601010 + 1842601011.

It is an arithmetic number, because the mean of its divisors is an integer number (1842601011).

Almost surely, 2^3685202021 is an apocalyptic number.

It is an amenable number.

3685202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3685202021 is an equidigital number, since it uses as much as digits as its factorization.

3685202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 3685202021 is about 60705.8647990456. The cubic root of 3685202021 is about 1544.6156598537.

Adding to 3685202021 its reverse (1202025863), we get a palindrome (4887227884).

The spelling of 3685202021 in words is "three billion, six hundred eighty-five million, two hundred two thousand, twenty-one".