20112121220220 has 144 divisors (see below), whose sum is σ = 61875854040000. Its totient is φ = 5287323672576.

The previous prime is 20112121220183. The next prime is 20112121220353. The reversal of 20112121220220 is 2202212121102.

It is a happy number.

20112121220220 is a `hidden beast` number, since 2 + 0 + 11 + 212 + 1 + 220 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20112121220193 and 20112121220202.

It is a congruent number.

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, 1328796 + ... + 6479964.

Almost surely, 2^{20112121220220} is an apocalyptic number.

20112121220220 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 20112121220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30937927020000).

20112121220220 is an abundant number, since it is smaller than the sum of its proper divisors (41763732819780).

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

20112121220220 is a wasteful number, since it uses less digits than its factorization.

20112121220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151492 (or 5151487 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20112121220220 its reverse (2202212121102), we get a palindrome (22314333341322).

The spelling of 20112121220220 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twenty".