16818350021 has 16 divisors (see below), whose sum is σ = 18406224000. Its totient is φ = 15240388800.

The previous prime is 16818349997. The next prime is 16818350033. The reversal of 16818350021 is 12005381861.

It is a cyclic number.

It is not a de Polignac number, because 16818350021 - 2⁶ = 16818349957 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 (16818350071) 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, 5408015 + ... + 5411123.

It is an arithmetic number, because the mean of its divisors is an integer number (1150389000).

Almost surely, 2^16818350021 is an apocalyptic number.

16818350021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16818350021 is a deficient number, since it is larger than the sum of its proper divisors (1587873979).

16818350021 is a wasteful number, since it uses less digits than its factorization.

16818350021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 16818350021 in words is "sixteen billion, eight hundred eighteen million, three hundred fifty thousand, twenty-one".