8421862381 has 2 divisors, whose sum is σ = 8421862382. Its totient is φ = 8421862380.

The previous prime is 8421862333. The next prime is 8421862403. The reversal of 8421862381 is 1832681248.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7129100356 + 1292762025 = 84434^2 + 35955^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421862381 - 2²¹ = 8419765229 is a prime.

It is a super-2 number, since 2×8421862381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421862301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210931190 + 4210931191.

It is an arithmetic number, because the mean of its divisors is an integer number (4210931191).

Almost surely, 2^8421862381 is an apocalyptic number.

It is an amenable number.

8421862381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421862381 is an equidigital number, since it uses as much as digits as its factorization.

8421862381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147456, while the sum is 43.

The square root of 8421862381 is about 91770.7054620373. The cubic root of 8421862381 is about 2034.5547449333.

The spelling of 8421862381 in words is "eight billion, four hundred twenty-one million, eight hundred sixty-two thousand, three hundred eighty-one".