21011001323123 has 8 divisors (see below), whose sum is σ = 24050034058080. Its totient is φ = 17981333867520.

The previous prime is 21011001323113. The next prime is 21011001323141. The reversal of 21011001323123 is 32132310011012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011001323123 - 2⁴ = 21011001323107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011001323095 and 21011001323104.

It is not an unprimeable number, because it can be changed into a prime (21011001323113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2341315028 + ... + 2341324001.

It is an arithmetic number, because the mean of its divisors is an integer number (3006254257260).

Almost surely, 2^{21011001323123} is an apocalyptic number.

21011001323123 is a deficient number, since it is larger than the sum of its proper divisors (3039032734957).

21011001323123 is an equidigital number, since it uses as much as digits as its factorization.

21011001323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682639677.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21011001323123 its reverse (32132310011012), we get a palindrome (53143311334135).

The spelling of 21011001323123 in words is "twenty-one trillion, eleven billion, one million, three hundred twenty-three thousand, one hundred twenty-three".