21022222120 has 32 divisors (see below), whose sum is σ = 47306989800. Its totient is φ = 8407646208.

The previous prime is 21022222033. The next prime is 21022222129. The reversal of 21022222120 is 2122222012.

It can be written as a sum of positive squares in 4 ways, for example, as 11017021444 + 10005200676 = 104962^2 + 100026^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21022222094 and 21022222103.

It is not an unprimeable number, because it can be changed into a prime (21022222129) 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, 264472 + ... + 334648.

Almost surely, 2^21022222120 is an apocalyptic number.

21022222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022222120 is an abundant number, since it is smaller than the sum of its proper divisors (26284767680).

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

21022222120 is a wasteful number, since it uses less digits than its factorization.

21022222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77677 (or 77673 counting only the distinct ones).

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

Adding to 21022222120 its reverse (2122222012), we get a palindrome (23144444132).

It can be divided in two parts, 2102 and 2222120, that added together give a palindrome (2224222).

The spelling of 21022222120 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, one hundred twenty".