11211220220 has 48 divisors (see below), whose sum is σ = 23862988800. Its totient is φ = 4423748160.

The previous prime is 11211220217. The next prime is 11211220243. The reversal of 11211220220 is 2202211211.

It is a junction number, because it is equal to n+sod(n) for n = 11211220195 and 11211220204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2271155 + ... + 2276085.

It is an arithmetic number, because the mean of its divisors is an integer number (497145600).

Almost surely, 2^11211220220 is an apocalyptic number.

11211220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211220220 is an abundant number, since it is smaller than the sum of its proper divisors (12651768580).

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

11211220220 is a wasteful number, since it uses less digits than its factorization.

11211220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6458 (or 6456 counting only the distinct ones).

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

Adding to 11211220220 its reverse (2202211211), we get a palindrome (13413431431).

Subtracting from 11211220220 its reverse (2202211211), we obtain a palindrome (9009009009).

The spelling of 11211220220 in words is "eleven billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty".