21373534724063 has 4 divisors (see below), whose sum is σ = 21406775058648. Its totient is φ = 21340294389480.

The previous prime is 21373534724023. The next prime is 21373534724093. The reversal of 21373534724063 is 36042743537312.

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 21373534724063 - 2¹⁶ = 21373534658527 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 (21373534724023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16620166328 + ... + 16620167613.

It is an arithmetic number, because the mean of its divisors is an integer number (5351693764662).

Almost surely, 2^{21373534724063} is an apocalyptic number.

21373534724063 is a deficient number, since it is larger than the sum of its proper divisors (33240334585).

21373534724063 is an equidigital number, since it uses as much as digits as its factorization.

21373534724063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33240334584.

The product of its (nonzero) digits is 7620480, while the sum is 50.

The spelling of 21373534724063 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred thirty-four million, seven hundred twenty-four thousand, sixty-three".