1213389130721 has 2 divisors, whose sum is σ = 1213389130722. Its totient is φ = 1213389130720.

The previous prime is 1213389130661. The next prime is 1213389130817. The reversal of 1213389130721 is 1270319833121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210528057600 + 2861073121 = 1100240^2 + 53489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213389130721 - 2¹⁴ = 1213389114337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213382130721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606694565360 + 606694565361.

It is an arithmetic number, because the mean of its divisors is an integer number (606694565361).

Almost surely, 2^{1213389130721} is an apocalyptic number.

It is an amenable number.

1213389130721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213389130721 is an equidigital number, since it uses as much as digits as its factorization.

1213389130721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 1213389130721 in words is "one trillion, two hundred thirteen billion, three hundred eighty-nine million, one hundred thirty thousand, seven hundred twenty-one".