11101220 has 24 divisors (see below), whose sum is σ = 25106424. Its totient is φ = 4098816.

The previous prime is 11101217. The next prime is 11101231. The reversal of 11101220 is 2210111.

It can be written as a sum of positive squares in 4 ways, for example, as 65536 + 11035684 = 256^2 + 3322^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11101198 and 11101207.

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, 21089 + ... + 21608.

It is an arithmetic number, because the mean of its divisors is an integer number (1046101).

Almost surely, 2^11101220 is an apocalyptic number.

11101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11101220 is an abundant number, since it is smaller than the sum of its proper divisors (14005204).

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

11101220 is a wasteful number, since it uses less digits than its factorization.

11101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42719 (or 42717 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 11101220 is about 3331.8493363296. The cubic root of 11101220 is about 223.0780826794.

Adding to 11101220 its reverse (2210111), we get a palindrome (13311331).

The spelling of 11101220 in words is "eleven million, one hundred one thousand, two hundred twenty".