12121013220 has 48 divisors (see below), whose sum is σ = 34268357760. Its totient is φ = 3200887296.

The previous prime is 12121013189. The next prime is 12121013231. The reversal of 12121013220 is 2231012121.

It is a super-2 number, since 2×12121013220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12121013220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 974485 + ... + 986844.

It is an arithmetic number, because the mean of its divisors is an integer number (713924120).

Almost surely, 2^12121013220 is an apocalyptic number.

12121013220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121013220 is an abundant number, since it is smaller than the sum of its proper divisors (22147344540).

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

12121013220 is a wasteful number, since it uses less digits than its factorization.

12121013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961444 (or 1961442 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12121013220 its reverse (2231012121), we get a palindrome (14352025341).

The spelling of 12121013220 in words is "twelve billion, one hundred twenty-one million, thirteen thousand, two hundred twenty".