90021842218 has 16 divisors (see below), whose sum is σ = 168352536384. Its totient is φ = 35073444960.

The previous prime is 90021842201. The next prime is 90021842227. The reversal of 90021842218 is 81224812009.

It is a happy number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 292278555 + ... + 292278862.

It is an arithmetic number, because the mean of its divisors is an integer number (10522033524).

Almost surely, 2^90021842218 is an apocalyptic number.

90021842218 is a deficient number, since it is larger than the sum of its proper divisors (78330694166).

90021842218 is a wasteful number, since it uses less digits than its factorization.

90021842218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584557437.

The product of its (nonzero) digits is 18432, while the sum is 37.

It can be divided in two parts, 90021 and 842218, that added together give a palindrome (932239).

The spelling of 90021842218 in words is "ninety billion, twenty-one million, eight hundred forty-two thousand, two hundred eighteen".