21120202010123 has 2 divisors, whose sum is σ = 21120202010124. Its totient is φ = 21120202010122.

The previous prime is 21120202010119. The next prime is 21120202010213. The reversal of 21120202010123 is 32101020202112.

Together with next prime (21120202010213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120202010123 - 2² = 21120202010119 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120202010923) 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, 10560101005061 + 10560101005062.

It is an arithmetic number, because the mean of its divisors is an integer number (10560101005062).

Almost surely, 2^{21120202010123} is an apocalyptic number.

21120202010123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120202010123 is an equidigital number, since it uses as much as digits as its factorization.

21120202010123 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 17.

Adding to 21120202010123 its reverse (32101020202112), we get a palindrome (53221222212235).

The spelling of 21120202010123 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, ten thousand, one hundred twenty-three".