21351044320001 has 16 divisors (see below), whose sum is σ = 23357684854080. Its totient is φ = 19355392230720.

The previous prime is 21351044319989. The next prime is 21351044320007. The reversal of 21351044320001 is 10002344015312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21351044320001 - 2³⁰ = 21349970578177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21351044320007) 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, 7493231 + ... + 9942363.

It is an arithmetic number, because the mean of its divisors is an integer number (1459855303380).

Almost surely, 2^{21351044320001} is an apocalyptic number.

It is an amenable number.

21351044320001 is a deficient number, since it is larger than the sum of its proper divisors (2006640534079).

21351044320001 is a wasteful number, since it uses less digits than its factorization.

21351044320001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2451376.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21351044320001 its reverse (10002344015312), we get a palindrome (31353388335313).

The spelling of 21351044320001 in words is "twenty-one trillion, three hundred fifty-one billion, forty-four million, three hundred twenty thousand, one".