21112012222123 has 2 divisors, whose sum is σ = 21112012222124. Its totient is φ = 21112012222122.

The previous prime is 21112012222087. The next prime is 21112012222127. The reversal of 21112012222123 is 32122221021112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112012222123 - 2²¹ = 21112010124971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112012222094 and 21112012222103.

It is not a weakly prime, because it can be changed into another prime (21112012222127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556006111061 + 10556006111062.

It is an arithmetic number, because the mean of its divisors is an integer number (10556006111062).

Almost surely, 2^{21112012222123} is an apocalyptic number.

21112012222123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112012222123 is an equidigital number, since it uses as much as digits as its factorization.

21112012222123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 21112012222123 its reverse (32122221021112), we get a palindrome (53234233243235).

The spelling of 21112012222123 in words is "twenty-one trillion, one hundred twelve billion, twelve million, two hundred twenty-two thousand, one hundred twenty-three".