21212103121212 has 48 divisors (see below), whose sum is σ = 52495651031040. Its totient is φ = 6643440483072.

The previous prime is 21212103121193. The next prime is 21212103121309. The reversal of 21212103121212 is 21212130121212.

It is a super-3 number, since 3×21212103121212³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88450012 + ... + 88689507.

It is an arithmetic number, because the mean of its divisors is an integer number (1093659396480).

Almost surely, 2^{21212103121212} is an apocalyptic number.

It is an amenable number.

21212103121212 is an abundant number, since it is smaller than the sum of its proper divisors (31283547909828).

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

21212103121212 is a wasteful number, since it uses less digits than its factorization.

21212103121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177140130 (or 177140128 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21212103121212 its reverse (21212130121212), we get a palindrome (42424233242424).

Subtracting 21212103121212 from its reverse (21212130121212), we obtain a cube (27000000 = 300³).

The spelling of 21212103121212 in words is "twenty-one trillion, two hundred twelve billion, one hundred three million, one hundred twenty-one thousand, two hundred twelve".