18198414421 has 16 divisors (see below), whose sum is σ = 20074579200. Its totient is φ = 16359624000.

The previous prime is 18198414397. The next prime is 18198414427. The reversal of 18198414421 is 12441489181.

It is a cyclic number.

It is not a de Polignac number, because 18198414421 - 2¹⁷ = 18198283349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198414427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911140 + ... + 930898.

It is an arithmetic number, because the mean of its divisors is an integer number (1254661200).

Almost surely, 2^18198414421 is an apocalyptic number.

18198414421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18198414421 is a deficient number, since it is larger than the sum of its proper divisors (1876164779).

18198414421 is a wasteful number, since it uses less digits than its factorization.

18198414421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20700.

The product of its digits is 73728, while the sum is 43.

The spelling of 18198414421 in words is "eighteen billion, one hundred ninety-eight million, four hundred fourteen thousand, four hundred twenty-one".