21101330220 has 48 divisors (see below), whose sum is σ = 61652586240. Its totient is φ = 5382367936.

The previous prime is 21101330219. The next prime is 21101330221. The reversal of 21101330220 is 2203310112.

It is an interprime number because it is at equal distance from previous prime (21101330219) and next prime (21101330221).

It is a super-2 number, since 2×21101330220² (a number of 21 digits) contains 22 as substring.

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 21101330220.

It is not an unprimeable number, because it can be changed into a prime (21101330221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7644030 + ... + 7646789.

It is an arithmetic number, because the mean of its divisors is an integer number (1284428880).

Almost surely, 2^21101330220 is an apocalyptic number.

21101330220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101330220 is an abundant number, since it is smaller than the sum of its proper divisors (40551256020).

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

21101330220 is a wasteful number, since it uses less digits than its factorization.

21101330220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15290854 (or 15290852 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21101330220 its reverse (2203310112), we get a palindrome (23304640332).

The spelling of 21101330220 in words is "twenty-one billion, one hundred one million, three hundred thirty thousand, two hundred twenty".