21301303123213 has 2 divisors, whose sum is σ = 21301303123214. Its totient is φ = 21301303123212.

The previous prime is 21301303123193. The next prime is 21301303123223. The reversal of 21301303123213 is 31232130310312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16934887500804 + 4366415622409 = 4115202^2 + 2089597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301303123213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301303123223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650651561606 + 10650651561607.

It is an arithmetic number, because the mean of its divisors is an integer number (10650651561607).

Almost surely, 2^{21301303123213} is an apocalyptic number.

It is an amenable number.

21301303123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301303123213 is an equidigital number, since it uses as much as digits as its factorization.

21301303123213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21301303123213 its reverse (31232130310312), we get a palindrome (52533433433525).

The spelling of 21301303123213 in words is "twenty-one trillion, three hundred one billion, three hundred three million, one hundred twenty-three thousand, two hundred thirteen".