1153530021323 has 4 divisors (see below), whose sum is σ = 1193306918640. Its totient is φ = 1113753124008.

The previous prime is 1153530021311. The next prime is 1153530021341. The reversal of 1153530021323 is 3231200353511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1153530021323 - 2²⁸ = 1153261585867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 39776897287 = 1153530021323 / (1 + 1 + 5 + 3 + 5 + 3 + 0 + 0 + 2 + 1 + 3 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1153530020323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19888448615 + ... + 19888448672.

It is an arithmetic number, because the mean of its divisors is an integer number (298326729660).

Almost surely, 2^{1153530021323} is an apocalyptic number.

1153530021323 is a deficient number, since it is larger than the sum of its proper divisors (39776897317).

1153530021323 is an equidigital number, since it uses as much as digits as its factorization.

1153530021323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39776897316.

The product of its (nonzero) digits is 8100, while the sum is 29.

Adding to 1153530021323 its reverse (3231200353511), we get a palindrome (4384730374834).

The spelling of 1153530021323 in words is "one trillion, one hundred fifty-three billion, five hundred thirty million, twenty-one thousand, three hundred twenty-three".