21210120100212 has 48 divisors (see below), whose sum is σ = 49531336888320. Its totient is φ = 7064175616992.

The previous prime is 21210120100207. The next prime is 21210120100237. The reversal of 21210120100212 is 21200102101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210120100191 and 21210120100200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247718713 + ... + 247804319.

It is an arithmetic number, because the mean of its divisors is an integer number (1031902851840).

Almost surely, 2^{21210120100212} is an apocalyptic number.

It is an amenable number.

21210120100212 is an abundant number, since it is smaller than the sum of its proper divisors (28321216788108).

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

21210120100212 is a wasteful number, since it uses less digits than its factorization.

21210120100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102500 (or 102498 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210120100212 its reverse (21200102101212), we get a palindrome (42410222201424).

The spelling of 21210120100212 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred thousand, two hundred twelve".