20111212110220 has 96 divisors (see below), whose sum is σ = 52658470158336. Its totient is φ = 6267994003200.

The previous prime is 20111212110179. The next prime is 20111212110277. The reversal of 20111212110220 is 2201121211102.

It is a junction number, because it is equal to n+sod(n) for n = 20111212110194 and 20111212110203.

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, 22069749 + ... + 22962931.

It is an arithmetic number, because the mean of its divisors is an integer number (548525730816).

Almost surely, 2^{20111212110220} is an apocalyptic number.

20111212110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111212110220 is an abundant number, since it is smaller than the sum of its proper divisors (32547258048116).

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

20111212110220 is a wasteful number, since it uses less digits than its factorization.

20111212110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907831 (or 907829 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20111212110220 its reverse (2201121211102), we get a palindrome (22312333321322).

The spelling of 20111212110220 in words is "twenty trillion, one hundred eleven billion, two hundred twelve million, one hundred ten thousand, two hundred twenty".