12102021220 has 24 divisors (see below), whose sum is σ = 25467321600. Its totient is φ = 4830698592.

The previous prime is 12102021199. The next prime is 12102021221. The reversal of 12102021220 is 2212020121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12102021220.

It is not an unprimeable number, because it can be changed into a prime (12102021221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622050 + ... + 641209.

It is an arithmetic number, because the mean of its divisors is an integer number (1061138400).

Almost surely, 2^12102021220 is an apocalyptic number.

12102021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12102021220 is an abundant number, since it is smaller than the sum of its proper divisors (13365300380).

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

12102021220 is a wasteful number, since it uses less digits than its factorization.

12102021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263747 (or 1263745 counting only the distinct ones).

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

Adding to 12102021220 its reverse (2212020121), we get a palindrome (14314041341).

The spelling of 12102021220 in words is "twelve billion, one hundred two million, twenty-one thousand, two hundred twenty".