21304513571233 has 4 divisors (see below), whose sum is σ = 21515449349268. Its totient is φ = 21093577793200.

The previous prime is 21304513571213. The next prime is 21304513571249. The reversal of 21304513571233 is 33217531540312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19583253538209 + 1721260033024 = 4425297^2 + 1311968^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304513571233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304513571213) 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, 105467888866 + ... + 105467889067.

It is an arithmetic number, because the mean of its divisors is an integer number (5378862337317).

Almost surely, 2^{21304513571233} is an apocalyptic number.

It is an amenable number.

21304513571233 is a deficient number, since it is larger than the sum of its proper divisors (210935778035).

21304513571233 is a wasteful number, since it uses less digits than its factorization.

21304513571233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210935778034.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 21304513571233 in words is "twenty-one trillion, three hundred four billion, five hundred thirteen million, five hundred seventy-one thousand, two hundred thirty-three".