1216205728339 has 16 divisors (see below), whose sum is σ = 1413579532288. Its totient is φ = 1024832492352.

The previous prime is 1216205728303. The next prime is 1216205728357. The reversal of 1216205728339 is 9338275026121.

It is a cyclic number.

It is not a de Polignac number, because 1216205728339 - 2¹⁹ = 1216205204051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216205728292 and 1216205728301.

It is not an unprimeable number, because it can be changed into a prime (1216205728369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3719427 + ... + 4033180.

It is an arithmetic number, because the mean of its divisors is an integer number (88348720768).

Almost surely, 2^{1216205728339} is an apocalyptic number.

1216205728339 is a deficient number, since it is larger than the sum of its proper divisors (197373803949).

1216205728339 is an equidigital number, since it uses as much as digits as its factorization.

1216205728339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7752994.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 1216205728339 in words is "one trillion, two hundred sixteen billion, two hundred five million, seven hundred twenty-eight thousand, three hundred thirty-nine".