21102002013123 has 24 divisors (see below), whose sum is σ = 30772072668480. Its totient is φ = 13933918280880.

The previous prime is 21102002013049. The next prime is 21102002013143. The reversal of 21102002013123 is 32131020020112.

21102002013123 is a `hidden beast` number, since 211 + 0 + 200 + 201 + 31 + 23 = 666.

It is not a de Polignac number, because 21102002013123 - 2¹³ = 21102002004931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102002013096 and 21102002013105.

It is not an unprimeable number, because it can be changed into a prime (21102002013143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16494493 + ... + 17727726.

It is an arithmetic number, because the mean of its divisors is an integer number (1282169694520).

Almost surely, 2^{21102002013123} is an apocalyptic number.

21102002013123 is a deficient number, since it is larger than the sum of its proper divisors (9670070655357).

21102002013123 is a wasteful number, since it uses less digits than its factorization.

21102002013123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34222879 (or 34222876 counting only the distinct ones).

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

Adding to 21102002013123 its reverse (32131020020112), we get a palindrome (53233022033235).

The spelling of 21102002013123 in words is "twenty-one trillion, one hundred two billion, two million, thirteen thousand, one hundred twenty-three".