15321120243 has 32 divisors (see below), whose sum is σ = 24008769792. Its totient is φ = 8567952000.

The previous prime is 15321120179. The next prime is 15321120251. The reversal of 15321120243 is 34202112351.

It is not a de Polignac number, because 15321120243 - 2⁶ = 15321120179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15321120253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1482193 + ... + 1492493.

It is an arithmetic number, because the mean of its divisors is an integer number (750274056).

Almost surely, 2^15321120243 is an apocalyptic number.

15321120243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

15321120243 is a deficient number, since it is larger than the sum of its proper divisors (8687649549).

15321120243 is a wasteful number, since it uses less digits than its factorization.

15321120243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13795.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 15321120243 its reverse (34202112351), we get a palindrome (49523232594).

The spelling of 15321120243 in words is "fifteen billion, three hundred twenty-one million, one hundred twenty thousand, two hundred forty-three".