211121121122220 has 96 divisors (see below), whose sum is σ = 595710903465216. Its totient is φ = 55863645011200.

The previous prime is 211121121122179. The next prime is 211121121122231. The reversal of 211121121122220 is 22221121121112.

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, 77984362 + ... + 80646158.

It is an arithmetic number, because the mean of its divisors is an integer number (6205321911096).

Almost surely, 2^{211121121122220} is an apocalyptic number.

211121121122220 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 211121121122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297855451732608).

211121121122220 is an abundant number, since it is smaller than the sum of its proper divisors (384589782342996).

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

211121121122220 is a wasteful number, since it uses less digits than its factorization.

211121121122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672031 (or 2672029 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211121121122220 its reverse (22221121121112), we get a palindrome (233342242243332).

The spelling of 211121121122220 in words is "two hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".