21325043234503 has 4 divisors (see below), whose sum is σ = 21581971466328. Its totient is φ = 21068115002680.

The previous prime is 21325043234489. The next prime is 21325043234531. The reversal of 21325043234503 is 30543234052312.

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 21325043234503 - 2¹⁷ = 21325043103431 is a prime.

It is a super-3 number, since 3×21325043234503³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325043232503) 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, 128464115788 + ... + 128464115953.

It is an arithmetic number, because the mean of its divisors is an integer number (5395492866582).

Almost surely, 2^{21325043234503} is an apocalyptic number.

21325043234503 is a deficient number, since it is larger than the sum of its proper divisors (256928231825).

21325043234503 is an equidigital number, since it uses as much as digits as its factorization.

21325043234503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256928231824.

The product of its (nonzero) digits is 259200, while the sum is 37.

Adding to 21325043234503 its reverse (30543234052312), we get a palindrome (51868277286815).

The spelling of 21325043234503 in words is "twenty-one trillion, three hundred twenty-five billion, forty-three million, two hundred thirty-four thousand, five hundred three".