211111220120 has 16 divisors (see below), whose sum is σ = 475000245360. Its totient is φ = 84444488032.

The previous prime is 211111220083. The next prime is 211111220141. The reversal of 211111220120 is 21022111112.

It is a junction number, because it is equal to n+sod(n) for n = 211111220095 and 211111220104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2638890212 + ... + 2638890291.

It is an arithmetic number, because the mean of its divisors is an integer number (29687515335).

Almost surely, 2^211111220120 is an apocalyptic number.

211111220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111220120 is an abundant number, since it is smaller than the sum of its proper divisors (263889025240).

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

211111220120 is a wasteful number, since it uses less digits than its factorization.

211111220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277780514 (or 5277780510 counting only the distinct ones).

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

Adding to 211111220120 its reverse (21022111112), we get a palindrome (232133331232).

The spelling of 211111220120 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred twenty".