21530123201 has 8 divisors (see below), whose sum is σ = 22896931680. Its totient is φ = 20186679168.

The previous prime is 21530123171. The next prime is 21530123213. The reversal of 21530123201 is 10232103512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21530123201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21530123261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5839211 + ... + 5842896.

It is an arithmetic number, because the mean of its divisors is an integer number (2862116460).

Almost surely, 2^21530123201 is an apocalyptic number.

It is an amenable number.

21530123201 is a deficient number, since it is larger than the sum of its proper divisors (1366808479).

21530123201 is a wasteful number, since it uses less digits than its factorization.

21530123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11682223.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21530123201 its reverse (10232103512), we get a palindrome (31762226713).

The spelling of 21530123201 in words is "twenty-one billion, five hundred thirty million, one hundred twenty-three thousand, two hundred one".