21210230203201 has 12 divisors (see below), whose sum is σ = 22970796744108. Its totient is φ = 19575685269504.

The previous prime is 21210230203147. The next prime is 21210230203229. The reversal of 21210230203201 is 10230203201212.

It can be written as a sum of positive squares in 6 ways, for example, as 5160984368400 + 16049245834801 = 2271780^2 + 4006151^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21210230203201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210230203601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8468640 + ... + 10683553.

It is an arithmetic number, because the mean of its divisors is an integer number (1914233062009).

Almost surely, 2^{21210230203201} is an apocalyptic number.

It is an amenable number.

21210230203201 is a deficient number, since it is larger than the sum of its proper divisors (1760566540907).

21210230203201 is a wasteful number, since it uses less digits than its factorization.

21210230203201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19158772 (or 19158759 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21210230203201 its reverse (10230203201212), we get a palindrome (31440433404413).

The spelling of 21210230203201 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty million, two hundred three thousand, two hundred one".