211121211121000 has 256 divisors, whose sum is σ = 507291638667840. Its totient is φ = 82209600000000.

The previous prime is 211121211120971. The next prime is 211121211121087. The reversal of 211121211121000 is 121112121112.

It can be written as a sum of positive squares in 32 ways, for example, as 45855839629636 + 165265371491364 = 6771694^2 + 12855558^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21323216050 + ... + 21323225950.

Almost surely, 2^{211121211121000} is an apocalyptic number.

211121211121000 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 211121211121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253645819333920).

211121211121000 is an abundant number, since it is smaller than the sum of its proper divisors (296170427546840).

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

211121211121000 is a wasteful number, since it uses less digits than its factorization.

211121211121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13545 (or 13531 counting only the distinct ones).

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

Adding to 211121211121000 its reverse (121112121112), we get a palindrome (211242323242112).

The spelling of 211121211121000 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred eleven million, one hundred twenty-one thousand".