12011212220 has 36 divisors (see below), whose sum is σ = 29341677960. Its totient is φ = 4118129568.

The previous prime is 12011212217. The next prime is 12011212223. The reversal of 12011212220 is 2221211021.

It is an interprime number because it is at equal distance from previous prime (12011212217) and next prime (12011212223).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 12011212195 and 12011212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011212223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6127190 + ... + 6129149.

It is an arithmetic number, because the mean of its divisors is an integer number (815046610).

Almost surely, 2^12011212220 is an apocalyptic number.

12011212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12011212220 is an abundant number, since it is smaller than the sum of its proper divisors (17330465740).

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

12011212220 is a wasteful number, since it uses less digits than its factorization.

12011212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12256362 (or 12256353 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12011212220 its reverse (2221211021), we get a palindrome (14232423241).

The spelling of 12011212220 in words is "twelve billion, eleven million, two hundred twelve thousand, two hundred twenty".