21375175427723 has 4 divisors (see below), whose sum is σ = 23019419691408. Its totient is φ = 19730931164040.

The previous prime is 21375175427719. The next prime is 21375175427737. The reversal of 21375175427723 is 32772457157312.

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

It is a cyclic number.

It is not a de Polignac number, because 21375175427723 - 2² = 21375175427719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375175427713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822122131823 + ... + 822122131848.

It is an arithmetic number, because the mean of its divisors is an integer number (5754854922852).

Almost surely, 2^{21375175427723} is an apocalyptic number.

21375175427723 is a deficient number, since it is larger than the sum of its proper divisors (1644244263685).

21375175427723 is a wasteful number, since it uses less digits than its factorization.

21375175427723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644244263684.

The product of its digits is 17287200, while the sum is 56.

The spelling of 21375175427723 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-five million, four hundred twenty-seven thousand, seven hundred twenty-three".