20012121111120 has 160 divisors (see below), whose sum is σ = 63262813777920. Its totient is φ = 5232008624640.

The previous prime is 20012121111109. The next prime is 20012121111161. The reversal of 20012121111120 is 2111112121002.

It is a happy number.

It is a super-2 number, since 2×20012121111120² (a number of 27 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 20012121111120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230344 + ... + 6330663.

It is an arithmetic number, because the mean of its divisors is an integer number (395392586112).

Almost surely, 2^{20012121111120} is an apocalyptic number.

20012121111120 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 20012121111120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31631406888960).

20012121111120 is an abundant number, since it is smaller than the sum of its proper divisors (43250692666800).

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

20012121111120 is a wasteful number, since it uses less digits than its factorization.

20012121111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561273 (or 6561267 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20012121111120 its reverse (2111112121002), we get a palindrome (22123233232122).

The spelling of 20012121111120 in words is "twenty trillion, twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty".