12012221020 has 24 divisors (see below), whose sum is σ = 25366597200. Its totient is φ = 4778044032.

The previous prime is 12012220963. The next prime is 12012221057. The reversal of 12012221020 is 2012221021.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1674105 + ... + 1681264.

It is an arithmetic number, because the mean of its divisors is an integer number (1056941550).

Almost surely, 2^12012221020 is an apocalyptic number.

12012221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012221020 is an abundant number, since it is smaller than the sum of its proper divisors (13354376180).

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

12012221020 is a wasteful number, since it uses less digits than its factorization.

12012221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355557 (or 3355555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12012221020 its reverse (2012221021), we get a palindrome (14024442041).

Subtracting from 12012221020 its reverse (2012221021), we obtain a palindrome (9999999999).

The spelling of 12012221020 in words is "twelve billion, twelve million, two hundred twenty-one thousand, twenty".