13021111301221 has 2 divisors, whose sum is σ = 13021111301222. Its totient is φ = 13021111301220.

The previous prime is 13021111301207. The next prime is 13021111301239. The reversal of 13021111301221 is 12210311112031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12076111504900 + 944999796321 = 3475070^2 + 972111^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021111301221 - 2²¹ = 13021109204069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13021111301521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6510555650610 + 6510555650611.

It is an arithmetic number, because the mean of its divisors is an integer number (6510555650611).

Almost surely, 2^{13021111301221} is an apocalyptic number.

It is an amenable number.

13021111301221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13021111301221 is an equidigital number, since it uses as much as digits as its factorization.

13021111301221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 13021111301221 its reverse (12210311112031), we get a palindrome (25231422413252).

The spelling of 13021111301221 in words is "thirteen trillion, twenty-one billion, one hundred eleven million, three hundred one thousand, two hundred twenty-one".