21120220220 has 48 divisors (see below), whose sum is σ = 48394620288. Its totient is φ = 7678474560.

The previous prime is 21120220193. The next prime is 21120220267. The reversal of 21120220220 is 2202202112.

21120220220 is a modest number, since divided by 220220 gives 21120 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21120220195 and 21120220204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1724639 + ... + 1736841.

It is an arithmetic number, because the mean of its divisors is an integer number (1008221256).

Almost surely, 2^21120220220 is an apocalyptic number.

21120220220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120220220 is an abundant number, since it is smaller than the sum of its proper divisors (27274400068).

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

21120220220 is a wasteful number, since it uses less digits than its factorization.

21120220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090 (or 20088 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21120220220 its reverse (2202202112), we get a palindrome (23322422332).

The spelling of 21120220220 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, two hundred twenty".