21747710641223 has 4 divisors (see below), whose sum is σ = 24854526447120. Its totient is φ = 18640894835328.

The previous prime is 21747710641213. The next prime is 21747710641229. The reversal of 21747710641223 is 32214601774712.

It is a happy number.

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 21747710641223 - 2⁶ = 21747710641159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21747710641229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553407902938 + ... + 1553407902951.

It is an arithmetic number, because the mean of its divisors is an integer number (6213631611780).

Almost surely, 2^{21747710641223} is an apocalyptic number.

21747710641223 is a deficient number, since it is larger than the sum of its proper divisors (3106815805897).

21747710641223 is an equidigital number, since it uses as much as digits as its factorization.

21747710641223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106815805896.

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 21747710641223 in words is "twenty-one trillion, seven hundred forty-seven billion, seven hundred ten million, six hundred forty-one thousand, two hundred twenty-three".