211101220 has 48 divisors (see below), whose sum is σ = 484743168. Its totient is φ = 76584960.

The previous prime is 211101217. The next prime is 211101221. The reversal of 211101220 is 22101112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 211101197 and 211101206.

It is not an unprimeable number, because it can be changed into a prime (211101221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126109 + ... + 127771.

It is an arithmetic number, because the mean of its divisors is an integer number (10098816).

Almost surely, 2^211101220 is an apocalyptic number.

211101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211101220 is an abundant number, since it is smaller than the sum of its proper divisors (273641948).

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

211101220 is a wasteful number, since it uses less digits than its factorization.

211101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260 (or 2258 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 211101220 is about 14529.3227646714. The cubic root of 211101220 is about 595.4293631347.

Adding to 211101220 its reverse (22101112), we get a palindrome (233202332).

The spelling of 211101220 in words is "two hundred eleven million, one hundred one thousand, two hundred twenty".