21374273112523 has 4 divisors (see below), whose sum is σ = 21375105696648. Its totient is φ = 21373440528400.

The previous prime is 21374273112487. The next prime is 21374273112587. The reversal of 21374273112523 is 32521137247312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21374273112523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21374273112523.

It is not an unprimeable number, because it can be changed into a prime (21374273112593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416253553 + ... + 416304898.

It is an arithmetic number, because the mean of its divisors is an integer number (5343776424162).

Almost surely, 2^{21374273112523} is an apocalyptic number.

21374273112523 is a deficient number, since it is larger than the sum of its proper divisors (832584125).

21374273112523 is an equidigital number, since it uses as much as digits as its factorization.

21374273112523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832584124.

The product of its digits is 423360, while the sum is 43.

The spelling of 21374273112523 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred seventy-three million, one hundred twelve thousand, five hundred twenty-three".