11212021220 has 96 divisors (see below), whose sum is σ = 26484796800. Its totient is φ = 3961903104.

The previous prime is 11212021217. The next prime is 11212021231. The reversal of 11212021220 is 2212021211.

It is a junction number, because it is equal to n+sod(n) for n = 11212021195 and 11212021204.

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, 696179 + ... + 712101.

It is an arithmetic number, because the mean of its divisors is an integer number (275883300).

Almost surely, 2^11212021220 is an apocalyptic number.

11212021220 is a gapful number since it is divisible by the number (10) 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 11212021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13242398400).

11212021220 is an abundant number, since it is smaller than the sum of its proper divisors (15272775580).

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

11212021220 is a wasteful number, since it uses less digits than its factorization.

11212021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16077 (or 16075 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11212021220 its reverse (2212021211), we get a palindrome (13424042431).

Subtracting from 11212021220 its reverse (2212021211), we obtain a palindrome (9000000009).

The spelling of 11212021220 in words is "eleven billion, two hundred twelve million, twenty-one thousand, two hundred twenty".