21264033530163 has 4 divisors (see below), whose sum is σ = 28352044706888. Its totient is φ = 14176022353440.

The previous prime is 21264033530143. The next prime is 21264033530189. The reversal of 21264033530163 is 36103533046212.

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

It is not a de Polignac number, because 21264033530163 - 2¹³ = 21264033521971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21264033530143) 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, 3544005588358 + ... + 3544005588363.

It is an arithmetic number, because the mean of its divisors is an integer number (7088011176722).

Almost surely, 2^{21264033530163} is an apocalyptic number.

21264033530163 is a deficient number, since it is larger than the sum of its proper divisors (7088011176725).

21264033530163 is an equidigital number, since it uses as much as digits as its factorization.

21264033530163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088011176724.

The product of its (nonzero) digits is 233280, while the sum is 39.

Adding to 21264033530163 its reverse (36103533046212), we get a palindrome (57367566576375).

It can be divided in two parts, 2126403 and 3530163, that added together give a triangular number (5656566 = T₃₃₆₃).

The spelling of 21264033530163 in words is "twenty-one trillion, two hundred sixty-four billion, thirty-three million, five hundred thirty thousand, one hundred sixty-three".