20121211218 has 32 divisors (see below), whose sum is σ = 40668604416. Its totient is φ = 6636325248.

The previous prime is 20121211171. The next prime is 20121211267. The reversal of 20121211218 is 81211212102.

It is a junction number, because it is equal to n+sod(n) for n = 20121211194 and 20121211203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248830 + ... + 319622.

It is an arithmetic number, because the mean of its divisors is an integer number (1270893888).

Almost surely, 2^20121211218 is an apocalyptic number.

20121211218 is an abundant number, since it is smaller than the sum of its proper divisors (20547393198).

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

20121211218 is a wasteful number, since it uses less digits than its factorization.

20121211218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71298.

The product of its (nonzero) digits is 128, while the sum is 21.

The spelling of 20121211218 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred eighteen".