12001121120220 has 72 divisors (see below), whose sum is σ = 33810562605456. Its totient is φ = 3180664806912.

The previous prime is 12001121120171. The next prime is 12001121120221. The reversal of 12001121120220 is 2202112110021.

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 12001121120220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001121120221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2169997 + ... + 5358276.

It is an arithmetic number, because the mean of its divisors is an integer number (469591147298).

Almost surely, 2^{12001121120220} is an apocalyptic number.

12001121120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12001121120220 is an abundant number, since it is smaller than the sum of its proper divisors (21809441485236).

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

12001121120220 is a wasteful number, since it uses less digits than its factorization.

12001121120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7528611 (or 7528446 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12001121120220 its reverse (2202112110021), we get a palindrome (14203233230241).

The spelling of 12001121120220 in words is "twelve trillion, one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twenty".