21010000218 has 16 divisors (see below), whose sum is σ = 42022692480. Its totient is φ = 7002884736.

The previous prime is 21010000217. The next prime is 21010000223. The reversal of 21010000218 is 81200001012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21010000197 and 21010000206.

It is not an unprimeable number, because it can be changed into a prime (21010000217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2455 + ... + 205002.

It is an arithmetic number, because the mean of its divisors is an integer number (2626418280).

Almost surely, 2^21010000218 is an apocalyptic number.

21010000218 is an abundant number, since it is smaller than the sum of its proper divisors (21012692262).

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

21010000218 is a wasteful number, since it uses less digits than its factorization.

21010000218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224341.

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

The spelling of 21010000218 in words is "twenty-one billion, ten million, two hundred eighteen", and thus it is an aban number.