21222221210120 has 64 divisors (see below), whose sum is σ = 54582896390400. Its totient is φ = 7274660739840.

The previous prime is 21222221209999. The next prime is 21222221210131. The reversal of 21222221210120 is 2101212222212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21222221210092 and 21222221210101.

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, 6630671 + ... + 9295710.

It is an arithmetic number, because the mean of its divisors is an integer number (852857756100).

Almost surely, 2^{21222221210120} is an apocalyptic number.

21222221210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222221210120 is an abundant number, since it is smaller than the sum of its proper divisors (33360675180280).

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

21222221210120 is a wasteful number, since it uses less digits than its factorization.

21222221210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15931158 (or 15931154 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222221210120 its reverse (2101212222212), we get a palindrome (23323433432332).

The spelling of 21222221210120 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty".