21530103353 has 32 divisors (see below), whose sum is σ = 25223270400. Its totient is φ = 18184622400.

The previous prime is 21530103347. The next prime is 21530103367. The reversal of 21530103353 is 35330103512.

It is a cyclic number.

It is not a de Polignac number, because 21530103353 - 2²² = 21525909049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21530103253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1764050 + ... + 1776212.

It is an arithmetic number, because the mean of its divisors is an integer number (788227200).

Almost surely, 2^21530103353 is an apocalyptic number.

It is an amenable number.

21530103353 is a deficient number, since it is larger than the sum of its proper divisors (3693167047).

21530103353 is a wasteful number, since it uses less digits than its factorization.

21530103353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12413.

The product of its (nonzero) digits is 4050, while the sum is 26.

Adding to 21530103353 its reverse (35330103512), we get a palindrome (56860206865).

The spelling of 21530103353 in words is "twenty-one billion, five hundred thirty million, one hundred three thousand, three hundred fifty-three".