21231201301 has 2 divisors, whose sum is σ = 21231201302. Its totient is φ = 21231201300.

The previous prime is 21231201283. The next prime is 21231201317. The reversal of 21231201301 is 10310213212.

It is an a-pointer prime, because the next prime (21231201317) can be obtained adding 21231201301 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12780076401 + 8451124900 = 113049^2 + 91930^2 .

It is a cyclic number.

It is not a de Polignac number, because 21231201301 - 2²⁹ = 20694330389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231201371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615600650 + 10615600651.

It is an arithmetic number, because the mean of its divisors is an integer number (10615600651).

Almost surely, 2^21231201301 is an apocalyptic number.

It is an amenable number.

21231201301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231201301 is an equidigital number, since it uses as much as digits as its factorization.

21231201301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21231201301 its reverse (10310213212), we get a palindrome (31541414513).

The spelling of 21231201301 in words is "twenty-one billion, two hundred thirty-one million, two hundred one thousand, three hundred one".