12222220212 has 144 divisors (see below), whose sum is σ = 34217601600. Its totient is φ = 3663429120.

The previous prime is 12222220207. The next prime is 12222220223. The reversal of 12222220212 is 21202222221.

12222220212 is a `hidden beast` number, since 12 + 222 + 220 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1031739 + ... + 1043517.

Almost surely, 2^12222220212 is an apocalyptic number.

12222220212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12222220212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17108800800).

12222220212 is an abundant number, since it is smaller than the sum of its proper divisors (21995381388).

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

12222220212 is a wasteful number, since it uses less digits than its factorization.

12222220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11886 (or 11881 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 12222220212 its reverse (21202222221), we get a palindrome (33424442433).

The spelling of 12222220212 in words is "twelve billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twelve".