11721020 has 12 divisors (see below), whose sum is σ = 24614184. Its totient is φ = 4688400.

The previous prime is 11721013. The next prime is 11721023. The reversal of 11721020 is 2012711.

It is a junction number, because it is equal to n+sod(n) for n = 11720986 and 11721004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721023) 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 3 ways as a sum of consecutive naturals, for example, 293006 + ... + 293045.

It is an arithmetic number, because the mean of its divisors is an integer number (2051182).

Almost surely, 2^11721020 is an apocalyptic number.

11721020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11721020 is an abundant number, since it is smaller than the sum of its proper divisors (12893164).

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

11721020 is a wasteful number, since it uses less digits than its factorization.

11721020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586060 (or 586058 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 11721020 is about 3423.5975230742. The cubic root of 11721020 is about 227.1547393393.

Adding to 11721020 its reverse (2012711), we get a palindrome (13733731).

The spelling of 11721020 in words is "eleven million, seven hundred twenty-one thousand, twenty".