21010212111223 has 2 divisors, whose sum is σ = 21010212111224. Its totient is φ = 21010212111222.

The previous prime is 21010212111209. The next prime is 21010212111313. The reversal of 21010212111223 is 32211121201012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010212111223 - 2⁹ = 21010212110711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010212111223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010212111023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505106055611 + 10505106055612.

It is an arithmetic number, because the mean of its divisors is an integer number (10505106055612).

Almost surely, 2^{21010212111223} is an apocalyptic number.

21010212111223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010212111223 is an equidigital number, since it uses as much as digits as its factorization.

21010212111223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21010212111223 its reverse (32211121201012), we get a palindrome (53221333312235).

The spelling of 21010212111223 in words is "twenty-one trillion, ten billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-three".