21030040321 has 8 divisors (see below), whose sum is σ = 21537396288. Its totient is φ = 20528550000.

The previous prime is 21030040319. The next prime is 21030040327. The reversal of 21030040321 is 12304003012.

It is a happy number.

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 21030040321 - 2¹ = 21030040319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21030040295 and 21030040304.

It is not an unprimeable number, because it can be changed into a prime (21030040327) 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, 1459155 + ... + 1473496.

It is an arithmetic number, because the mean of its divisors is an integer number (2692174536).

Almost surely, 2^21030040321 is an apocalyptic number.

It is an amenable number.

21030040321 is a deficient number, since it is larger than the sum of its proper divisors (507355967).

21030040321 is a wasteful number, since it uses less digits than its factorization.

21030040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932823.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21030040321 its reverse (12304003012), we get a palindrome (33334043333).

The spelling of 21030040321 in words is "twenty-one billion, thirty million, forty thousand, three hundred twenty-one".