21330323021 has 8 divisors (see below), whose sum is σ = 24972085824. Its totient is φ = 17837203680.

The previous prime is 21330322987. The next prime is 21330323023. The reversal of 21330323021 is 12032303312.

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 21330323021 - 2¹⁴ = 21330306637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21330322984 and 21330323002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330323023) 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, 37160555 + ... + 37161128.

It is an arithmetic number, because the mean of its divisors is an integer number (3121510728).

Almost surely, 2^21330323021 is an apocalyptic number.

It is an amenable number.

21330323021 is a deficient number, since it is larger than the sum of its proper divisors (3641762803).

21330323021 is an equidigital number, since it uses as much as digits as its factorization.

21330323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74321731.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21330323021 its reverse (12032303312), we get a palindrome (33362626333).

The spelling of 21330323021 in words is "twenty-one billion, three hundred thirty million, three hundred twenty-three thousand, twenty-one".