211111121000 has 128 divisors (see below), whose sum is σ = 532397698560. Its totient is φ = 77890464000.

The previous prime is 211111120967. The next prime is 211111121077. The reversal of 211111121000 is 121111112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19897697 + ... + 19908303.

It is an arithmetic number, because the mean of its divisors is an integer number (4159357020).

Almost surely, 2^211111121000 is an apocalyptic number.

211111121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211111121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266198849280).

211111121000 is an abundant number, since it is smaller than the sum of its proper divisors (321286577560).

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

211111121000 is a wasteful number, since it uses less digits than its factorization.

211111121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172 (or 12158 counting only the distinct ones).

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

Adding to 211111121000 its reverse (121111112), we get a palindrome (211232232112).

The spelling of 211111121000 in words is "two hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand".