20012231121220 has 144 divisors (see below), whose sum is σ = 46825357449024. Its totient is φ = 7141616121600.

The previous prime is 20012231121163. The next prime is 20012231121241. The reversal of 20012231121220 is 2212113221002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196588935 + ... + 196690705.

It is an arithmetic number, because the mean of its divisors is an integer number (325176093396).

Almost surely, 2^{20012231121220} is an apocalyptic number.

20012231121220 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 20012231121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23412678724512).

20012231121220 is an abundant number, since it is smaller than the sum of its proper divisors (26813126327804).

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

20012231121220 is a wasteful number, since it uses less digits than its factorization.

20012231121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102642 (or 102609 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20012231121220 its reverse (2212113221002), we get a palindrome (22224344342222).

The spelling of 20012231121220 in words is "twenty trillion, twelve billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred twenty".