20111212121120 has 96 divisors (see below), whose sum is σ = 50030802662400. Its totient is φ = 7618440462336.

The previous prime is 20111212121113. The next prime is 20111212121137. The reversal of 20111212121120 is 2112121211102.

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, 7603232 + ... + 9901088.

It is an arithmetic number, because the mean of its divisors is an integer number (521154194400).

Almost surely, 2^{20111212121120} is an apocalyptic number.

20111212121120 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 20111212121120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25015401331200).

20111212121120 is an abundant number, since it is smaller than the sum of its proper divisors (29919590541280).

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

20111212121120 is a wasteful number, since it uses less digits than its factorization.

20111212121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300770 (or 2300762 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111212121120 its reverse (2112121211102), we get a palindrome (22223333332222).

The spelling of 20111212121120 in words is "twenty trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty".