11211011220 has 48 divisors (see below), whose sum is σ = 31404941568. Its totient is φ = 2988259200.

The previous prime is 11211011219. The next prime is 11211011243. The reversal of 11211011220 is 2211011211.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 11211011196 and 11211011205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96370 + ... + 178070.

It is an arithmetic number, because the mean of its divisors is an integer number (654269616).

Almost surely, 2^11211011220 is an apocalyptic number.

11211011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211011220 is an abundant number, since it is smaller than the sum of its proper divisors (20193930348).

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

11211011220 is a wasteful number, since it uses less digits than its factorization.

11211011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84000 (or 83998 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11211011220 its reverse (2211011211), we get a palindrome (13422022431).

Subtracting from 11211011220 its reverse (2211011211), we obtain a palindrome (9000000009).

The spelling of 11211011220 in words is "eleven billion, two hundred eleven million, eleven thousand, two hundred twenty".