8421919090 has 32 divisors (see below), whose sum is σ = 16357768560. Its totient is φ = 3103497984.

The previous prime is 8421919063. The next prime is 8421919097. The reversal of 8421919090 is 909191248.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4937732361 + 3484186729 = 70269^2 + 59027^2 .

It is not an unprimeable number, because it can be changed into a prime (8421919097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2532 + ... + 129808.

Almost surely, 2^8421919090 is an apocalyptic number.

8421919090 is a deficient number, since it is larger than the sum of its proper divisors (7935849470).

8421919090 is a wasteful number, since it uses less digits than its factorization.

8421919090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127806.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 8421919090 is about 91771.0144326628. The cubic root of 8421919090 is about 2034.5593115126.

The spelling of 8421919090 in words is "eight billion, four hundred twenty-one million, nine hundred nineteen thousand, ninety".