21353430321051 has 16 divisors (see below), whose sum is σ = 28481818416000. Its totient is φ = 14230331638848.

The previous prime is 21353430321029. The next prime is 21353430321071. The reversal of 21353430321051 is 15012303435312.

It is not a de Polignac number, because 21353430321051 - 2⁹ = 21353430320539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21353430321071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320651380 + ... + 320717966.

It is an arithmetic number, because the mean of its divisors is an integer number (1780113651000).

Almost surely, 2^{21353430321051} is an apocalyptic number.

21353430321051 is a deficient number, since it is larger than the sum of its proper divisors (7128388094949).

21353430321051 is a wasteful number, since it uses less digits than its factorization.

21353430321051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104698.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 21353430321051 its reverse (15012303435312), we get a palindrome (36365733756363).

The spelling of 21353430321051 in words is "twenty-one trillion, three hundred fifty-three billion, four hundred thirty million, three hundred twenty-one thousand, fifty-one".