21000000210018 has 16 divisors (see below), whose sum is σ = 42163424549280. Its totient is φ = 6972762715136.

The previous prime is 21000000210011. The next prime is 21000000210037. The reversal of 21000000210018 is 81001200000012.

It is a junction number, because it is equal to n+sod(n) for n = 21000000209979 and 21000000210006.

It is not an unprimeable number, because it can be changed into a prime (21000000210011) by changing a digit.

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, 6809337048 + ... + 6809340131.

It is an arithmetic number, because the mean of its divisors is an integer number (2635214034330).

Almost surely, 2^{21000000210018} is an apocalyptic number.

21000000210018 is an abundant number, since it is smaller than the sum of its proper divisors (21163424339262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000000210018 is a wasteful number, since it uses less digits than its factorization.

21000000210018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13618677441.

The product of its (nonzero) digits is 32, while the sum is 15.

The spelling of 21000000210018 in words is "twenty-one trillion, two hundred ten thousand, eighteen".