211121220120 has 64 divisors (see below), whose sum is σ = 633638557440. Its totient is φ = 56274556800.

The previous prime is 211121220007. The next prime is 211121220221. The reversal of 211121220120 is 21022121112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211121220120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103326 + ... + 657965.

It is an arithmetic number, because the mean of its divisors is an integer number (9900602460).

Almost surely, 2^211121220120 is an apocalyptic number.

211121220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211121220120 is an abundant number, since it is smaller than the sum of its proper divisors (422517337320).

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

211121220120 is a wasteful number, since it uses less digits than its factorization.

211121220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763616 (or 763612 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211121220120 its reverse (21022121112), we get a palindrome (232143341232).

The spelling of 211121220120 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty".