3842097221 has 2 divisors, whose sum is σ = 3842097222. Its totient is φ = 3842097220.

The previous prime is 3842097209. The next prime is 3842097229. The reversal of 3842097221 is 1227902483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2034912100 + 1807185121 = 45110^2 + 42511^2 .

It is an emirp because it is prime and its reverse (1227902483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3842097221 - 2⁶ = 3842097157 is a prime.

It is a super-2 number, since 2×3842097221² = 29523422111231845682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3842097229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1921048610 + 1921048611.

It is an arithmetic number, because the mean of its divisors is an integer number (1921048611).

Almost surely, 2^3842097221 is an apocalyptic number.

It is an amenable number.

3842097221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3842097221 is an equidigital number, since it uses as much as digits as its factorization.

3842097221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 3842097221 is about 61984.6531086526. The cubic root of 3842097221 is about 1566.2320859254.

The spelling of 3842097221 in words is "three billion, eight hundred forty-two million, ninety-seven thousand, two hundred twenty-one".