20120121211200 has 84 divisors (see below), whose sum is σ = 66010764356160. Its totient is φ = 5365365655040.

The previous prime is 20120121211123. The next prime is 20120121211241. The reversal of 20120121211200 is 211212102102.

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 20120121211200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2095841160 + ... + 2095850759.

Almost surely, 2^{20120121211200} is an apocalyptic number.

20120121211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120121211200 is an abundant number, since it is smaller than the sum of its proper divisors (45890643144960).

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

20120121211200 is a wasteful number, since it uses less digits than its factorization.

20120121211200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4191691944 (or 4191691929 counting only the distinct ones).

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

Adding to 20120121211200 its reverse (211212102102), we get a palindrome (20331333313302).

The spelling of 20120121211200 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred".