20111100212120 has 64 divisors (see below), whose sum is σ = 46660611695040. Its totient is φ = 7796259072000.

The previous prime is 20111100212117. The next prime is 20111100212153. The reversal of 20111100212120 is 2121200111102.

It is a junction number, because it is equal to n+sod(n) for n = 20111100212095 and 20111100212104.

It is a congruent number.

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, 40357877 + ... + 40853156.

It is an arithmetic number, because the mean of its divisors is an integer number (729072057735).

Almost surely, 2^{20111100212120} is an apocalyptic number.

20111100212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111100212120 is an abundant number, since it is smaller than the sum of its proper divisors (26549511482920).

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

20111100212120 is a wasteful number, since it uses less digits than its factorization.

20111100212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81211236 (or 81211232 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111100212120 its reverse (2121200111102), we get a palindrome (22232300323222).

The spelling of 20111100212120 in words is "twenty trillion, one hundred eleven billion, one hundred million, two hundred twelve thousand, one hundred twenty".