21030242321 has 32 divisors (see below), whose sum is σ = 24699340800. Its totient is φ = 17704440000.

The previous prime is 21030242291. The next prime is 21030242339. The reversal of 21030242321 is 12324203012.

It is a cyclic number.

It is not a de Polignac number, because 21030242321 - 2³⁰ = 19956500497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030242293 and 21030242302.

It is not an unprimeable number, because it can be changed into a prime (21030242341) 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, 1661306 + ... + 1673916.

It is an arithmetic number, because the mean of its divisors is an integer number (771854400).

Almost surely, 2^21030242321 is an apocalyptic number.

It is an amenable number.

21030242321 is a deficient number, since it is larger than the sum of its proper divisors (3669098479).

21030242321 is a wasteful number, since it uses less digits than its factorization.

21030242321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12821.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21030242321 its reverse (12324203012), we get a palindrome (33354445333).

The spelling of 21030242321 in words is "twenty-one billion, thirty million, two hundred forty-two thousand, three hundred twenty-one".