21102202210120 has 32 divisors (see below), whose sum is σ = 50272893502200. Its totient is φ = 7944358478848.

The previous prime is 21102202210097. The next prime is 21102202210127. The reversal of 21102202210120 is 2101220220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18917262962404 + 2184939247716 = 4349398^2 + 1478154^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102202210094 and 21102202210103.

It is not an unprimeable number, because it can be changed into a prime (21102202210127) 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 7 ways as a sum of consecutive naturals, for example, 15516324475 + ... + 15516325834.

Almost surely, 2^{21102202210120} is an apocalyptic number.

21102202210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102202210120 is an abundant number, since it is smaller than the sum of its proper divisors (29170691292080).

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

21102202210120 is a wasteful number, since it uses less digits than its factorization.

21102202210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31032650337 (or 31032650333 counting only the distinct ones).

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

Adding to 21102202210120 its reverse (2101220220112), we get a palindrome (23203422430232).

The spelling of 21102202210120 in words is "twenty-one trillion, one hundred two billion, two hundred two million, two hundred ten thousand, one hundred twenty".