218402420990 has 16 divisors (see below), whose sum is σ = 423364693248. Its totient is φ = 80640893856.

The previous prime is 218402420983. The next prime is 218402420993. The reversal of 218402420990 is 99024204812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218402420993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840009182 + ... + 840009441.

It is an arithmetic number, because the mean of its divisors is an integer number (26460293328).

Almost surely, 2^218402420990 is an apocalyptic number.

218402420990 is a deficient number, since it is larger than the sum of its proper divisors (204962272258).

218402420990 is a wasteful number, since it uses less digits than its factorization.

218402420990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680018643.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 218402420990 in words is "two hundred eighteen billion, four hundred two million, four hundred twenty thousand, nine hundred ninety".