21202120210120 has 32 divisors (see below), whose sum is σ = 48020696118720. Its totient is φ = 8424683524800.

The previous prime is 21202120210069. The next prime is 21202120210151. The reversal of 21202120210120 is 2101202120212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21202120210094 and 21202120210103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1755136362 + ... + 1755148441.

It is an arithmetic number, because the mean of its divisors is an integer number (1500646753710).

Almost surely, 2^{21202120210120} is an apocalyptic number.

21202120210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202120210120 is an abundant number, since it is smaller than the sum of its proper divisors (26818575908600).

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

21202120210120 is a wasteful number, since it uses less digits than its factorization.

21202120210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510284965 (or 3510284961 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202120210120 its reverse (2101202120212), we get a palindrome (23303322330332).

The spelling of 21202120210120 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, two hundred ten thousand, one hundred twenty".