21420116868123 has 12 divisors (see below), whose sum is σ = 30941658664488. Its totient is φ = 14279390286720.

The previous prime is 21420116868119. The next prime is 21420116868167. The reversal of 21420116868123 is 32186861102412.

21420116868123 is a `hidden beast` number, since 2 + 1 + 420 + 1 + 168 + 68 + 1 + 2 + 3 = 666.

It is not a de Polignac number, because 21420116868123 - 2² = 21420116868119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21420116868823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57104790 + ... + 57478667.

It is an arithmetic number, because the mean of its divisors is an integer number (2578471555374).

Almost surely, 2^{21420116868123} is an apocalyptic number.

21420116868123 is a deficient number, since it is larger than the sum of its proper divisors (9521541796365).

21420116868123 is a wasteful number, since it uses less digits than its factorization.

21420116868123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114604234 (or 114604231 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 21420116868123 in words is "twenty-one trillion, four hundred twenty billion, one hundred sixteen million, eight hundred sixty-eight thousand, one hundred twenty-three".