211111010220 has 48 divisors (see below), whose sum is σ = 644848178688. Its totient is φ = 51178426560.

The previous prime is 211111010207. The next prime is 211111010221. The reversal of 211111010220 is 22010111112.

It is a super-3 number, since 3×211111010220³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 211111010196 and 211111010205.

It is not an unprimeable number, because it can be changed into a prime (211111010221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159931924 + ... + 159933243.

It is an arithmetic number, because the mean of its divisors is an integer number (13434337056).

Almost surely, 2^211111010220 is an apocalyptic number.

211111010220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111010220 is an abundant number, since it is smaller than the sum of its proper divisors (433737168468).

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

211111010220 is a wasteful number, since it uses less digits than its factorization.

211111010220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319865190 (or 319865188 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211111010220 its reverse (22010111112), we get a palindrome (233121121332).

The spelling of 211111010220 in words is "two hundred eleven billion, one hundred eleven million, ten thousand, two hundred twenty".