21102111120123 has 36 divisors (see below), whose sum is σ = 33507469306584. Its totient is φ = 12787726723200.

The previous prime is 21102111120121. The next prime is 21102111120133. The reversal of 21102111120123 is 32102111120112.

It is a happy number.

21102111120123 is a `hidden beast` number, since 211 + 0 + 211 + 1 + 120 + 123 = 666.

It is not a de Polignac number, because 21102111120123 - 2¹ = 21102111120121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102111120096 and 21102111120105.

It is not an unprimeable number, because it can be changed into a prime (21102111120121) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8689411 + ... + 10849427.

It is an arithmetic number, because the mean of its divisors is an integer number (930763036294).

Almost surely, 2^{21102111120123} is an apocalyptic number.

21102111120123 is a deficient number, since it is larger than the sum of its proper divisors (12405358186461).

21102111120123 is a wasteful number, since it uses less digits than its factorization.

21102111120123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169016 (or 2169002 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21102111120123 its reverse (32102111120112), we get a palindrome (53204222240235).

The spelling of 21102111120123 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-three".