21000032103123 has 24 divisors (see below), whose sum is σ = 30345916251456. Its totient is φ = 13994236522800.

The previous prime is 21000032103059. The next prime is 21000032103157. The reversal of 21000032103123 is 32130123000012.

It is not a de Polignac number, because 21000032103123 - 2⁶ = 21000032103059 is a prime.

It is a super-2 number, since 2×21000032103123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000032103096 and 21000032103105.

It is not an unprimeable number, because it can be changed into a prime (21000032103163) 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 in 23 ways as a sum of consecutive naturals, for example, 229887568 + ... + 229978898.

It is an arithmetic number, because the mean of its divisors is an integer number (1264413177144).

Almost surely, 2^{21000032103123} is an apocalyptic number.

21000032103123 is a deficient number, since it is larger than the sum of its proper divisors (9345884148333).

21000032103123 is a wasteful number, since it uses less digits than its factorization.

21000032103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101615 (or 101612 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21000032103123 its reverse (32130123000012), we get a palindrome (53130155103135).

The spelling of 21000032103123 in words is "twenty-one trillion, thirty-two million, one hundred three thousand, one hundred twenty-three".