11121820 has 24 divisors (see below), whose sum is σ = 23436000. Its totient is φ = 4433472.

The previous prime is 11121767. The next prime is 11121823. The reversal of 11121820 is 2812111.

11121820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11121820² = 247389760224800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11121794 and 11121803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6406 + ... + 7954.

It is an arithmetic number, because the mean of its divisors is an integer number (976500).

Almost surely, 2^11121820 is an apocalyptic number.

11121820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11121820 is an abundant number, since it is smaller than the sum of its proper divisors (12314180).

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

11121820 is a wasteful number, since it uses less digits than its factorization.

11121820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1915 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 11121820 is about 3334.9392798071. The cubic root of 11121820 is about 223.2159825060.

Adding to 11121820 its reverse (2812111), we get a palindrome (13933931).

The spelling of 11121820 in words is "eleven million, one hundred twenty-one thousand, eight hundred twenty".