211112021220 has 24 divisors (see below), whose sum is σ = 591113659584. Its totient is φ = 56296538976.

The previous prime is 211112021203. The next prime is 211112021233. The reversal of 211112021220 is 22120211112.

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 211112021220.

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 7 ways as a sum of consecutive naturals, for example, 1759266784 + ... + 1759266903.

It is an arithmetic number, because the mean of its divisors is an integer number (24629735816).

Almost surely, 2^211112021220 is an apocalyptic number.

211112021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211112021220 is an abundant number, since it is smaller than the sum of its proper divisors (380001638364).

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

211112021220 is a wasteful number, since it uses less digits than its factorization.

211112021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518533699 (or 3518533697 counting only the distinct ones).

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

Adding to 211112021220 its reverse (22120211112), we get a palindrome (233232232332).

The spelling of 211112021220 in words is "two hundred eleven billion, one hundred twelve million, twenty-one thousand, two hundred twenty".