320103021155 has 4 divisors (see below), whose sum is σ = 384123625392. Its totient is φ = 256082416920.

The previous prime is 320103021149. The next prime is 320103021167. The reversal of 320103021155 is 551120301023.

It is a happy number.

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

It is not a de Polignac number, because 320103021155 - 2¹⁰ = 320103020131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320103021155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32010302111 + ... + 32010302120.

It is an arithmetic number, because the mean of its divisors is an integer number (96030906348).

Almost surely, 2^320103021155 is an apocalyptic number.

320103021155 is a deficient number, since it is larger than the sum of its proper divisors (64020604237).

320103021155 is an equidigital number, since it uses as much as digits as its factorization.

320103021155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64020604236.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 320103021155 its reverse (551120301023), we get a palindrome (871223322178).

The spelling of 320103021155 in words is "three hundred twenty billion, one hundred three million, twenty-one thousand, one hundred fifty-five".