211111011012220 has 48 divisors (see below), whose sum is σ = 484460046258048. Its totient is φ = 76636860695360.

The previous prime is 211111011012199. The next prime is 211111011012271. The reversal of 211111011012220 is 22210110111112.

It is a junction number, because it is equal to n+sod(n) for n = 211111011012194 and 211111011012203.

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, 817243522 + ... + 817501801.

It is an arithmetic number, because the mean of its divisors is an integer number (10092917630376).

Almost surely, 2^{211111011012220} is an apocalyptic number.

211111011012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111011012220 is an abundant number, since it is smaller than the sum of its proper divisors (273349035245828).

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

211111011012220 is a wasteful number, since it uses less digits than its factorization.

211111011012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634745930 (or 1634745928 counting only the distinct ones).

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

Adding to 211111011012220 its reverse (22210110111112), we get a palindrome (233321121123332).

The spelling of 211111011012220 in words is "two hundred eleven trillion, one hundred eleven billion, eleven million, twelve thousand, two hundred twenty".