21212103129211 has 2 divisors, whose sum is σ = 21212103129212. Its totient is φ = 21212103129210.

The previous prime is 21212103129199. The next prime is 21212103129227. The reversal of 21212103129211 is 11292130121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212103129211 - 2²⁵ = 21212069574779 is a prime.

It is a super-3 number, since 3×21212103129211³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21212103129211.

It is not a weakly prime, because it can be changed into another prime (21212103129241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606051564605 + 10606051564606.

It is an arithmetic number, because the mean of its divisors is an integer number (10606051564606).

Almost surely, 2^{21212103129211} is an apocalyptic number.

21212103129211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212103129211 is an equidigital number, since it uses as much as digits as its factorization.

21212103129211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 21212103129211 in words is "twenty-one trillion, two hundred twelve billion, one hundred three million, one hundred twenty-nine thousand, two hundred eleven".