21103322220 has 144 divisors (see below), whose sum is σ = 66484061280. Its totient is φ = 5413782528.

The previous prime is 21103322209. The next prime is 21103322221. The reversal of 21103322220 is 2222330112.

21103322220 is a `hidden beast` number, since 2 + 110 + 332 + 2 + 220 = 666.

It is a super-2 number, since 2×21103322220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21103322193 and 21103322202.

It is not an unprimeable number, because it can be changed into a prime (21103322221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 574939 + ... + 610541.

It is an arithmetic number, because the mean of its divisors is an integer number (461694870).

Almost surely, 2^21103322220 is an apocalyptic number.

21103322220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103322220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33242030640).

21103322220 is an abundant number, since it is smaller than the sum of its proper divisors (45380739060).

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

21103322220 is a wasteful number, since it uses less digits than its factorization.

21103322220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35744 (or 35739 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21103322220 its reverse (2222330112), we get a palindrome (23325652332).

The spelling of 21103322220 in words is "twenty-one billion, one hundred three million, three hundred twenty-two thousand, two hundred twenty".