21042452321 has 8 divisors (see below), whose sum is σ = 24305720544. Its totient is φ = 18004237120.

The previous prime is 21042452309. The next prime is 21042452323. The reversal of 21042452321 is 12325424012.

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 21042452321 - 2²⁶ = 20975343457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21042452323) 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, 56263055 + ... + 56263428.

It is an arithmetic number, because the mean of its divisors is an integer number (3038215068).

Almost surely, 2^21042452321 is an apocalyptic number.

It is an amenable number.

21042452321 is a deficient number, since it is larger than the sum of its proper divisors (3263268223).

21042452321 is a wasteful number, since it uses less digits than its factorization.

21042452321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112526511.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21042452321 its reverse (12325424012), we get a palindrome (33367876333).

The spelling of 21042452321 in words is "twenty-one billion, forty-two million, four hundred fifty-two thousand, three hundred twenty-one".