21202212210120 has 96 divisors (see below), whose sum is σ = 68911402131000. Its totient is φ = 5653577619456.

The previous prime is 21202212210083. The next prime is 21202212210121. The reversal of 21202212210120 is 2101221220212.

It is a happy number.

21202212210120 is a `hidden beast` number, since 2 + 120 + 2 + 212 + 210 + 120 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20673226555524 + 528985654596 = 4546782^2 + 727314^2 .

It is a super-3 number, since 3×21202212210120³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21202212210093 and 21202212210102.

It is not an unprimeable number, because it can be changed into a prime (21202212210121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4123906 + ... + 7707854.

Almost surely, 2^{21202212210120} is an apocalyptic number.

21202212210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202212210120 is an abundant number, since it is smaller than the sum of its proper divisors (47709189920880).

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

21202212210120 is a wasteful number, since it uses less digits than its factorization.

21202212210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600399 (or 3600392 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21202212210120 its reverse (2101221220212), we get a palindrome (23303433430332).

The spelling of 21202212210120 in words is "twenty-one trillion, two hundred two billion, two hundred twelve million, two hundred ten thousand, one hundred twenty".