11221940 has 12 divisors (see below), whose sum is σ = 23566116. Its totient is φ = 4488768.

The previous prime is 11221939. The next prime is 11221949. The reversal of 11221940 is 4912211.

It can be written as a sum of positive squares in 2 ways, for example, as 5180176 + 6041764 = 2276^2 + 2458^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 561097 = 11221940 / (1 + 1 + 2 + 2 + 1 + 9 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221949) 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, 280529 + ... + 280568.

It is an arithmetic number, because the mean of its divisors is an integer number (1963843).

Almost surely, 2^11221940 is an apocalyptic number.

11221940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221940 is an abundant number, since it is smaller than the sum of its proper divisors (12344176).

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

11221940 is a wasteful number, since it uses less digits than its factorization.

11221940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561106 (or 561104 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 11221940 is about 3349.9164168677. The cubic root of 11221940 is about 223.8837885719.

The spelling of 11221940 in words is "eleven million, two hundred twenty-one thousand, nine hundred forty".