11212220220 has 24 divisors (see below), whose sum is σ = 31394216784. Its totient is φ = 2989925376.

The previous prime is 11212220179. The next prime is 11212220231. The reversal of 11212220220 is 2202221211.

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 11212220220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93435109 + ... + 93435228.

It is an arithmetic number, because the mean of its divisors is an integer number (1308092366).

Almost surely, 2^11212220220 is an apocalyptic number.

11212220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212220220 is an abundant number, since it is smaller than the sum of its proper divisors (20181996564).

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

11212220220 is a wasteful number, since it uses less digits than its factorization.

11212220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186870349 (or 186870347 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 11212220220 its reverse (2202221211), we get a palindrome (13414441431).

Subtracting from 11212220220 its reverse (2202221211), we obtain a palindrome (9009999009).

The spelling of 11212220220 in words is "eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty".