21120020202220 has 24 divisors (see below), whose sum is σ = 44447014697904. Its totient is φ = 8429918124096.

The previous prime is 21120020202187. The next prime is 21120020202223. The reversal of 21120020202220 is 2220202002112.

It is a junction number, because it is equal to n+sod(n) for n = 21120020202194 and 21120020202203.

It is not an unprimeable number, because it can be changed into a prime (21120020202223) 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, 1130612727 + ... + 1130631406.

It is an arithmetic number, because the mean of its divisors is an integer number (1851958945746).

Almost surely, 2^{21120020202220} is an apocalyptic number.

21120020202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120020202220 is an abundant number, since it is smaller than the sum of its proper divisors (23326994495684).

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

21120020202220 is a wasteful number, since it uses less digits than its factorization.

21120020202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261244609 (or 2261244607 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21120020202220 its reverse (2220202002112), we get a palindrome (23340222204332).

The spelling of 21120020202220 in words is "twenty-one trillion, one hundred twenty billion, twenty million, two hundred two thousand, two hundred twenty".