211121200120 has 16 divisors (see below), whose sum is σ = 475022700360. Its totient is φ = 84448480032.

The previous prime is 211121200117. The next prime is 211121200127. The reversal of 211121200120 is 21002121112.

It is a super-2 number, since 2×211121200120² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211121200120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121200127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2639014962 + ... + 2639015041.

Almost surely, 2^211121200120 is an apocalyptic number.

211121200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211121200120 is an abundant number, since it is smaller than the sum of its proper divisors (263901500240).

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

211121200120 is a wasteful number, since it uses less digits than its factorization.

211121200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278030014 (or 5278030010 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211121200120 its reverse (21002121112), we get a palindrome (232123321232).

The spelling of 211121200120 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred thousand, one hundred twenty".