20120121111200 has 288 divisors, whose sum is σ = 56089821271680. Its totient is φ = 6976204083200.

The previous prime is 20120121111197. The next prime is 20120121111241. The reversal of 20120121111200 is 211112102102.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64004006 + ... + 64317594.

It is an arithmetic number, because the mean of its divisors is an integer number (194756323860).

Almost surely, 2^{20120121111200} is an apocalyptic number.

20120121111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20120121111200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28044910635840).

20120121111200 is an abundant number, since it is smaller than the sum of its proper divisors (35969700160480).

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

20120121111200 is a wasteful number, since it uses less digits than its factorization.

20120121111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313960 (or 313947 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20120121111200 its reverse (211112102102), we get a palindrome (20331233213302).

The spelling of 20120121111200 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, two hundred".