21103441220 has 24 divisors (see below), whose sum is σ = 44451129408. Its totient is φ = 8415871200.

The previous prime is 21103441187. The next prime is 21103441243. The reversal of 21103441220 is 2214430112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21103441192 and 21103441201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587296 + ... + 1600535.

It is an arithmetic number, because the mean of its divisors is an integer number (1852130392).

Almost surely, 2^21103441220 is an apocalyptic number.

21103441220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103441220 is an abundant number, since it is smaller than the sum of its proper divisors (23347688188).

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

21103441220 is a wasteful number, since it uses less digits than its factorization.

21103441220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3188171 (or 3188169 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21103441220 its reverse (2214430112), we get a palindrome (23317871332).

The spelling of 21103441220 in words is "twenty-one billion, one hundred three million, four hundred forty-one thousand, two hundred twenty".