21123120010023 has 20 divisors (see below), whose sum is σ = 31554475856200. Its totient is φ = 14081997234672.

The previous prime is 21123120009997. The next prime is 21123120010049. The reversal of 21123120010023 is 32001002132112.

21123120010023 is a `hidden beast` number, since 211 + 231 + 200 + 1 + 0 + 0 + 23 = 666.

It is an interprime number because it is at equal distance from previous prime (21123120009997) and next prime (21123120010049).

It is not a de Polignac number, because 21123120010023 - 2²⁴ = 21123103232807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123120009978 and 21123120010005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123120010063) 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 19 ways as a sum of consecutive naturals, for example, 15119328 + ... + 16457226.

It is an arithmetic number, because the mean of its divisors is an integer number (1577723792810).

Almost surely, 2^{21123120010023} is an apocalyptic number.

21123120010023 is a deficient number, since it is larger than the sum of its proper divisors (10431355846177).

21123120010023 is a wasteful number, since it uses less digits than its factorization.

21123120010023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532828 (or 1532819 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21123120010023 its reverse (32001002132112), we get a palindrome (53124122142135).

The spelling of 21123120010023 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred twenty million, ten thousand, twenty-three".