21530254033 has 8 divisors (see below), whose sum is σ = 21812269248. Its totient is φ = 21248777424.

The previous prime is 21530254021. The next prime is 21530254117. The reversal of 21530254033 is 33045203512.

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-21530254033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21530253992 and 21530254010.

It is not an unprimeable number, because it can be changed into a prime (21530252033) 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, 53866 + ... + 214387.

It is an arithmetic number, because the mean of its divisors is an integer number (2726533656).

Almost surely, 2^21530254033 is an apocalyptic number.

It is an amenable number.

21530254033 is a deficient number, since it is larger than the sum of its proper divisors (282015215).

21530254033 is an equidigital number, since it uses as much as digits as its factorization.

21530254033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269303.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21530254033 its reverse (33045203512), we get a palindrome (54575457545).

The spelling of 21530254033 in words is "twenty-one billion, five hundred thirty million, two hundred fifty-four thousand, thirty-three".