21112101010123 has 2 divisors, whose sum is σ = 21112101010124. Its totient is φ = 21112101010122.

The previous prime is 21112101010079. The next prime is 21112101010151. The reversal of 21112101010123 is 32101010121112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112101010123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112101010097 and 21112101010106.

It is not a weakly prime, because it can be changed into another prime (21112101010183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556050505061 + 10556050505062.

It is an arithmetic number, because the mean of its divisors is an integer number (10556050505062).

Almost surely, 2^{21112101010123} is an apocalyptic number.

21112101010123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112101010123 is an equidigital number, since it uses as much as digits as its factorization.

21112101010123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21112101010123 its reverse (32101010121112), we get a palindrome (53213111131235).

The spelling of 21112101010123 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, ten thousand, one hundred twenty-three".