3655030021 has 2 divisors, whose sum is σ = 3655030022. Its totient is φ = 3655030020.

The previous prime is 3655030009. The next prime is 3655030033. The reversal of 3655030021 is 1200305563.

It is a happy number.

3655030021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (3655030009) and next prime (3655030033).

It can be written as a sum of positive squares in only one way, i.e., 2249604900 + 1405425121 = 47430^2 + 37489^2 .

It is a cyclic number.

It is not a de Polignac number, because 3655030021 - 2⁹ = 3655029509 is a prime.

It is a super-2 number, since 2×3655030021² = 26718488908822520882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3655030091) 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, 1827515010 + 1827515011.

It is an arithmetic number, because the mean of its divisors is an integer number (1827515011).

Almost surely, 2^3655030021 is an apocalyptic number.

It is an amenable number.

3655030021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3655030021 is an equidigital number, since it uses as much as digits as its factorization.

3655030021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 3655030021 is about 60456.8442858209. The cubic root of 3655030021 is about 1540.3886719257.

Adding to 3655030021 its reverse (1200305563), we get a palindrome (4855335584).

The spelling of 3655030021 in words is "three billion, six hundred fifty-five million, thirty thousand, twenty-one".