21530033101 has 8 divisors (see below), whose sum is σ = 21556908864. Its totient is φ = 21503176800.

The previous prime is 21530033093. The next prime is 21530033111. The reversal of 21530033101 is 10133003512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21530033101 - 2³ = 21530033093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21530033111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3807126 + ... + 3812776.

It is an arithmetic number, because the mean of its divisors is an integer number (2694613608).

Almost surely, 2^21530033101 is an apocalyptic number.

It is an amenable number.

21530033101 is a deficient number, since it is larger than the sum of its proper divisors (26875763).

21530033101 is a wasteful number, since it uses less digits than its factorization.

21530033101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9731.

The product of its (nonzero) digits is 270, while the sum is 19.

Adding to 21530033101 its reverse (10133003512), we get a palindrome (31663036613).

The spelling of 21530033101 in words is "twenty-one billion, five hundred thirty million, thirty-three thousand, one hundred one".