13201240021 has 2 divisors, whose sum is σ = 13201240022. Its totient is φ = 13201240020.

The previous prime is 13201240007. The next prime is 13201240049. The reversal of 13201240021 is 12004210231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13107731121 + 93508900 = 114489^2 + 9670^2 .

It is a cyclic number.

It is not a de Polignac number, because 13201240021 - 2¹⁹ = 13200715733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13201239977 and 13201240004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13201240121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6600620010 + 6600620011.

It is an arithmetic number, because the mean of its divisors is an integer number (6600620011).

Almost surely, 2^13201240021 is an apocalyptic number.

It is an amenable number.

13201240021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13201240021 is an equidigital number, since it uses as much as digits as its factorization.

13201240021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 13201240021 its reverse (12004210231), we get a palindrome (25205450252).

The spelling of 13201240021 in words is "thirteen billion, two hundred one million, two hundred forty thousand, twenty-one".