21304052353 has 8 divisors (see below), whose sum is σ = 21825923616. Its totient is φ = 20782288800.

The previous prime is 21304052339. The next prime is 21304052359. The reversal of 21304052353 is 35325040312.

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 21304052353 - 2²⁵ = 21270497921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304052359) 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, 496450 + ... + 537652.

It is an arithmetic number, because the mean of its divisors is an integer number (2728240452).

Almost surely, 2^21304052353 is an apocalyptic number.

It is an amenable number.

21304052353 is a deficient number, since it is larger than the sum of its proper divisors (521871263).

21304052353 is a wasteful number, since it uses less digits than its factorization.

21304052353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53855.

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

Adding to 21304052353 its reverse (35325040312), we get a palindrome (56629092665).

The spelling of 21304052353 in words is "twenty-one billion, three hundred four million, fifty-two thousand, three hundred fifty-three".