11121222220 has 12 divisors (see below), whose sum is σ = 23354566704. Its totient is φ = 4448488880.

The previous prime is 11121222199. The next prime is 11121222239. The reversal of 11121222220 is 2222212111.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 11121222194 and 11121222203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278030536 + ... + 278030575.

It is an arithmetic number, because the mean of its divisors is an integer number (1946213892).

Almost surely, 2^11121222220 is an apocalyptic number.

11121222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11121222220 is an abundant number, since it is smaller than the sum of its proper divisors (12233344484).

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

11121222220 is a wasteful number, since it uses less digits than its factorization.

11121222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556061120 (or 556061118 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11121222220 its reverse (2222212111), we get a palindrome (13343434331).

The spelling of 11121222220 in words is "eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".