21000110122123 has 48 divisors (see below), whose sum is σ = 24625922724000. Its totient is φ = 17754280980480.

The previous prime is 21000110122109. The next prime is 21000110122247. The reversal of 21000110122123 is 32122101100012.

It is not a de Polignac number, because 21000110122123 - 2⁵ = 21000110122091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000110122097 and 21000110122106.

It is not an unprimeable number, because it can be changed into a prime (21000110120123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 438236161 + ... + 438284077.

It is an arithmetic number, because the mean of its divisors is an integer number (513040056750).

Almost surely, 2^{21000110122123} is an apocalyptic number.

21000110122123 is a deficient number, since it is larger than the sum of its proper divisors (3625812601877).

21000110122123 is a wasteful number, since it uses less digits than its factorization.

21000110122123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49600 (or 49583 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21000110122123 its reverse (32122101100012), we get a palindrome (53122211222135).

The spelling of 21000110122123 in words is "twenty-one trillion, one hundred ten million, one hundred twenty-two thousand, one hundred twenty-three".