3996218221 has 2 divisors, whose sum is σ = 3996218222. Its totient is φ = 3996218220.

The previous prime is 3996218207. The next prime is 3996218243. The reversal of 3996218221 is 1228126993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3707592100 + 288626121 = 60890^2 + 16989^2 .

It is a cyclic number.

It is not a de Polignac number, because 3996218221 - 2¹⁷ = 3996087149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3996218021) 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, 1998109110 + 1998109111.

It is an arithmetic number, because the mean of its divisors is an integer number (1998109111).

Almost surely, 2^3996218221 is an apocalyptic number.

It is an amenable number.

3996218221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3996218221 is an equidigital number, since it uses as much as digits as its factorization.

3996218221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 3996218221 is about 63215.6485452771. The cubic root of 3996218221 is about 1586.9006275636.

The spelling of 3996218221 in words is "three billion, nine hundred ninety-six million, two hundred eighteen thousand, two hundred twenty-one".