21212102102012 has 12 divisors (see below), whose sum is σ = 37675226121960. Its totient is φ = 10447751781456.

The previous prime is 21212102102003. The next prime is 21212102102017. The reversal of 21212102102012 is 21020120121212.

It is a super-3 number, since 3×21212102102012³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212102102017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39574817087 + ... + 39574817622.

It is an arithmetic number, because the mean of its divisors is an integer number (3139602176830).

Almost surely, 2^{21212102102012} is an apocalyptic number.

It is an amenable number.

21212102102012 is a deficient number, since it is larger than the sum of its proper divisors (16463124019948).

21212102102012 is a wasteful number, since it uses less digits than its factorization.

21212102102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79149634780 (or 79149634778 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212102102012 its reverse (21020120121212), we get a palindrome (42232222223224).

The spelling of 21212102102012 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, one hundred two thousand, twelve".