7838862221 has 2 divisors, whose sum is σ = 7838862222. Its totient is φ = 7838862220.

The previous prime is 7838862193. The next prime is 7838862223. The reversal of 7838862221 is 1222688387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6693039721 + 1145822500 = 81811^2 + 33850^2 .

It is an emirp because it is prime and its reverse (1222688387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7838862221 - 2¹⁰ = 7838861197 is a prime.

It is a super-2 number, since 2×7838862221² (a number of 21 digits) contains 22 as substring.

Together with 7838862223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7838862223) 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, 3919431110 + 3919431111.

It is an arithmetic number, because the mean of its divisors is an integer number (3919431111).

Almost surely, 2^7838862221 is an apocalyptic number.

It is an amenable number.

7838862221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7838862221 is an equidigital number, since it uses as much as digits as its factorization.

7838862221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 47.

The square root of 7838862221 is about 88537.3492996035. The cubic root of 7838862221 is about 1986.4806715422.

The spelling of 7838862221 in words is "seven billion, eight hundred thirty-eight million, eight hundred sixty-two thousand, two hundred twenty-one".