21530354530025 has 96 divisors (see below), whose sum is σ = 30601946492928. Its totient is φ = 14889700108800.

The previous prime is 21530354529991. The next prime is 21530354530049. The reversal of 21530354530025 is 52003545303512.

It is not a de Polignac number, because 21530354530025 - 2⁶ = 21530354529961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 63045884 + ... + 63386466.

It is an arithmetic number, because the mean of its divisors is an integer number (318770275968).

Almost surely, 2^{21530354530025} is an apocalyptic number.

21530354530025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21530354530025 is a deficient number, since it is larger than the sum of its proper divisors (9071591962903).

21530354530025 is a wasteful number, since it uses less digits than its factorization.

21530354530025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340791 (or 340786 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 38.

Adding to 21530354530025 its reverse (52003545303512), we get a palindrome (73533899833537).

The spelling of 21530354530025 in words is "twenty-one trillion, five hundred thirty billion, three hundred fifty-four million, five hundred thirty thousand, twenty-five".