21212110303123 has 2 divisors, whose sum is σ = 21212110303124. Its totient is φ = 21212110303122.

The previous prime is 21212110303103. The next prime is 21212110303169. The reversal of 21212110303123 is 32130301121212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212110303123 - 2²⁹ = 21211573432211 is a prime.

It is a super-3 number, since 3×21212110303123³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212110303094 and 21212110303103.

It is not a weakly prime, because it can be changed into another prime (21212110303103) by changing a digit.

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 as a sum of consecutive naturals, namely, 10606055151561 + 10606055151562.

It is an arithmetic number, because the mean of its divisors is an integer number (10606055151562).

Almost surely, 2^{21212110303123} is an apocalyptic number.

21212110303123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212110303123 is an equidigital number, since it uses as much as digits as its factorization.

21212110303123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21212110303123 its reverse (32130301121212), we get a palindrome (53342411424335).

The spelling of 21212110303123 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten million, three hundred three thousand, one hundred twenty-three".