21010113120123 has 6 divisors (see below), whose sum is σ = 30347941173524. Its totient is φ = 14006742080076.

The previous prime is 21010113120121. The next prime is 21010113120133. The reversal of 21010113120123 is 32102131101012.

21010113120123 is a `hidden beast` number, since 210 + 10 + 11 + 312 + 0 + 123 = 666.

It is not a de Polignac number, because 21010113120123 - 2¹ = 21010113120121 is a prime.

It is a super-3 number, since 3×21010113120123³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010113120096 and 21010113120105.

It is not an unprimeable number, because it can be changed into a prime (21010113120121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167228506665 + ... + 1167228506682.

Almost surely, 2^{21010113120123} is an apocalyptic number.

21010113120123 is a deficient number, since it is larger than the sum of its proper divisors (9337828053401).

21010113120123 is a wasteful number, since it uses less digits than its factorization.

21010113120123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334457013353 (or 2334457013350 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21010113120123 its reverse (32102131101012), we get a palindrome (53112244221135).

The spelling of 21010113120123 in words is "twenty-one trillion, ten billion, one hundred thirteen million, one hundred twenty thousand, one hundred twenty-three".