21324001564503 has 24 divisors (see below), whose sum is σ = 33645611475216. Its totient is φ = 12906654825600.

The previous prime is 21324001564493. The next prime is 21324001564517. The reversal of 21324001564503 is 30546510042312.

21324001564503 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 4 + 0 + 0 + 1 + 5 + 645 + 0 + 3 = 666.

It is not a de Polignac number, because 21324001564503 - 2⁴ = 21324001564487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324001564703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141445000 + ... + 141595677.

It is an arithmetic number, because the mean of its divisors is an integer number (1401900478134).

Almost surely, 2^{21324001564503} is an apocalyptic number.

21324001564503 is a deficient number, since it is larger than the sum of its proper divisors (12321609910713).

21324001564503 is a wasteful number, since it uses less digits than its factorization.

21324001564503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283041455 (or 283041452 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 21324001564503 in words is "twenty-one trillion, three hundred twenty-four billion, one million, five hundred sixty-four thousand, five hundred three".