211111110020 has 12 divisors (see below), whose sum is σ = 443333331084. Its totient is φ = 84444444000.

The previous prime is 211111110019. The next prime is 211111110043. The reversal of 211111110020 is 20011111112.

It can be written as a sum of positive squares in 2 ways, for example, as 35590331716 + 175520778304 = 188654^2 + 418952^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211111109983 and 211111110010.

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, 5277777731 + ... + 5277777770.

It is an arithmetic number, because the mean of its divisors is an integer number (36944444257).

Almost surely, 2^211111110020 is an apocalyptic number.

211111110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211111110020 is an abundant number, since it is smaller than the sum of its proper divisors (232222221064).

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

211111110020 is a wasteful number, since it uses less digits than its factorization.

211111110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555555510 (or 10555555508 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 211111110020 its reverse (20011111112), we get a palindrome (231122221132).

The spelling of 211111110020 in words is "two hundred eleven billion, one hundred eleven million, one hundred ten thousand, twenty".