8182190021 has 2 divisors, whose sum is σ = 8182190022. Its totient is φ = 8182190020.

The previous prime is 8182189999. The next prime is 8182190041. The reversal of 8182190021 is 1200912818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7226700100 + 955489921 = 85010^2 + 30911^2 .

It is a cyclic number.

It is not a de Polignac number, because 8182190021 - 2⁶ = 8182189957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8182190021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8182190041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4091095010 + 4091095011.

It is an arithmetic number, because the mean of its divisors is an integer number (4091095011).

Almost surely, 2^8182190021 is an apocalyptic number.

It is an amenable number.

8182190021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8182190021 is an equidigital number, since it uses as much as digits as its factorization.

8182190021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 8182190021 is about 90455.4587683905. The cubic root of 8182190021 is about 2015.0686840001.

The spelling of 8182190021 in words is "eight billion, one hundred eighty-two million, one hundred ninety thousand, twenty-one".