11271220 has 12 divisors (see below), whose sum is σ = 23669604. Its totient is φ = 4508480.

The previous prime is 11271193. The next prime is 11271223. The reversal of 11271220 is 2217211.

It can be written as a sum of positive squares in 2 ways, for example, as 3587236 + 7683984 = 1894^2 + 2772^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11271194 and 11271203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11271223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281761 + ... + 281800.

It is an arithmetic number, because the mean of its divisors is an integer number (1972467).

Almost surely, 2^11271220 is an apocalyptic number.

11271220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11271220 is an abundant number, since it is smaller than the sum of its proper divisors (12398384).

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

11271220 is a wasteful number, since it uses less digits than its factorization.

11271220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563570 (or 563568 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 11271220 is about 3357.2637668196. The cubic root of 11271220 is about 224.2110309293.

Adding to 11271220 its reverse (2217211), we get a palindrome (13488431).

The spelling of 11271220 in words is "eleven million, two hundred seventy-one thousand, two hundred twenty".