11221620 has 24 divisors (see below), whose sum is σ = 31420704. Its totient is φ = 2992416.

The previous prime is 11221601. The next prime is 11221627. The reversal of 11221620 is 2612211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11221620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93454 + ... + 93573.

It is an arithmetic number, because the mean of its divisors is an integer number (1309196).

Almost surely, 2^11221620 is an apocalyptic number.

11221620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221620 is an abundant number, since it is smaller than the sum of its proper divisors (20199084).

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

11221620 is a wasteful number, since it uses less digits than its factorization.

11221620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187039 (or 187037 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 11221620 is about 3349.8686541415. The cubic root of 11221620 is about 223.8816604938.

Adding to 11221620 its reverse (2612211), we get a palindrome (13833831).

The spelling of 11221620 in words is "eleven million, two hundred twenty-one thousand, six hundred twenty".