1153220321155 has 12 divisors (see below), whose sum is σ = 1609801428240. Its totient is φ = 790779648624.

The previous prime is 1153220321153. The next prime is 1153220321173. The reversal of 1153220321155 is 5511230223511.

It is a happy number.

It is not a de Polignac number, because 1153220321155 - 2¹ = 1153220321153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1153220321153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2353510615 + ... + 2353511104.

It is an arithmetic number, because the mean of its divisors is an integer number (134150119020).

Almost surely, 2^{1153220321155} is an apocalyptic number.

1153220321155 is a deficient number, since it is larger than the sum of its proper divisors (456581107085).

1153220321155 is an equidigital number, since it uses as much as digits as its factorization.

1153220321155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4707021738 (or 4707021731 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 1153220321155 its reverse (5511230223511), we get a palindrome (6664450544666).

The spelling of 1153220321155 in words is "one trillion, one hundred fifty-three billion, two hundred twenty million, three hundred twenty-one thousand, one hundred fifty-five".