21365103564023 has 4 divisors (see below), whose sum is σ = 21365129617608. Its totient is φ = 21365077510440.

The previous prime is 21365103564001. The next prime is 21365103564037. The reversal of 21365103564023 is 32046530156312.

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 21365103564023 - 2⁶ = 21365103563959 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 (21365103564073) 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, 11755361 + ... + 13450602.

It is an arithmetic number, because the mean of its divisors is an integer number (5341282404402).

Almost surely, 2^{21365103564023} is an apocalyptic number.

21365103564023 is a deficient number, since it is larger than the sum of its proper divisors (26053585).

21365103564023 is an equidigital number, since it uses as much as digits as its factorization.

21365103564023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26053584.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21365103564023 in words is "twenty-one trillion, three hundred sixty-five billion, one hundred three million, five hundred sixty-four thousand, twenty-three".