12011221012 has 12 divisors (see below), whose sum is σ = 24022442080. Its totient is φ = 5147666136.

The previous prime is 12011221009. The next prime is 12011221031. The reversal of 12011221012 is 21012211021.

12011221012 is an admirable number.

It is a super-2 number, since 2×12011221012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12011220983 and 12011221001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214486062 + ... + 214486117.

Almost surely, 2^12011221012 is an apocalyptic number.

It is an amenable number.

12011221012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12011221012 is a wasteful number, since it uses less digits than its factorization.

12011221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428972190 (or 428972188 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12011221012 its reverse (21012211021), we get a palindrome (33023432033).

Subtracting 12011221012 from its reverse (21012211021), we obtain a palindrome (9000990009).

The spelling of 12011221012 in words is "twelve billion, eleven million, two hundred twenty-one thousand, twelve".