3661220302021 has 2 divisors, whose sum is σ = 3661220302022. Its totient is φ = 3661220302020.

The previous prime is 3661220302013. The next prime is 3661220302031. The reversal of 3661220302021 is 1202030221663.

3661220302021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2251242171396 + 1409978130625 = 1500414^2 + 1187425^2 .

It is a cyclic number.

It is not a de Polignac number, because 3661220302021 - 2³ = 3661220302013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3661220302031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1830610151010 + 1830610151011.

It is an arithmetic number, because the mean of its divisors is an integer number (1830610151011).

Almost surely, 2^{3661220302021} is an apocalyptic number.

It is an amenable number.

3661220302021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3661220302021 is an equidigital number, since it uses as much as digits as its factorization.

3661220302021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 3661220302021 its reverse (1202030221663), we get a palindrome (4863250523684).

The spelling of 3661220302021 in words is "three trillion, six hundred sixty-one billion, two hundred twenty million, three hundred two thousand, twenty-one".