21012120112223 has 2 divisors, whose sum is σ = 21012120112224. Its totient is φ = 21012120112222.

The previous prime is 21012120112219. The next prime is 21012120112261. The reversal of 21012120112223 is 32221102121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012120112223 - 2² = 21012120112219 is a prime.

It is a super-2 number, since 2×21012120112223² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012120112195 and 21012120112204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012120112283) 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, 10506060056111 + 10506060056112.

It is an arithmetic number, because the mean of its divisors is an integer number (10506060056112).

Almost surely, 2^{21012120112223} is an apocalyptic number.

21012120112223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012120112223 is an equidigital number, since it uses as much as digits as its factorization.

21012120112223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21012120112223 its reverse (32221102121012), we get a palindrome (53233222233235).

The spelling of 21012120112223 in words is "twenty-one trillion, twelve billion, one hundred twenty million, one hundred twelve thousand, two hundred twenty-three".