21364721267323 has 16 divisors (see below), whose sum is σ = 24985149097216. Its totient is φ = 17886391397280.

The previous prime is 21364721267317. The next prime is 21364721267339. The reversal of 21364721267323 is 32376212746312.

It is not a de Polignac number, because 21364721267323 - 2⁵ = 21364721267291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21364721267423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15224728 + ... + 16568698.

It is an arithmetic number, because the mean of its divisors is an integer number (1561571818576).

Almost surely, 2^{21364721267323} is an apocalyptic number.

21364721267323 is a deficient number, since it is larger than the sum of its proper divisors (3620427829893).

21364721267323 is a wasteful number, since it uses less digits than its factorization.

21364721267323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396834.

The product of its digits is 3048192, while the sum is 49.

The spelling of 21364721267323 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred twenty-one million, two hundred sixty-seven thousand, three hundred twenty-three".