320121011 has 4 divisors (see below), whose sum is σ = 365852592. Its totient is φ = 274389432.

The previous prime is 320120993. The next prime is 320121017. The reversal of 320121011 is 110121023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110121023 = 79 ⋅1393937.

It is a cyclic number.

It is not a de Polignac number, because 320121011 - 2¹⁸ = 319858867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320120983 and 320121001.

It is not an unprimeable number, because it can be changed into a prime (320121017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22865780 + ... + 22865793.

It is an arithmetic number, because the mean of its divisors is an integer number (91463148).

Almost surely, 2^320121011 is an apocalyptic number.

320121011 is a deficient number, since it is larger than the sum of its proper divisors (45731581).

320121011 is an equidigital number, since it uses as much as digits as its factorization.

320121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45731580.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 320121011 is about 17891.9258605663. The cubic root of 320121011 is about 684.0765869295.

Adding to 320121011 its product of nonzero digits (12), we get a palindrome (320121023).

Adding to 320121011 its reverse (110121023), we get a palindrome (430242034).

The spelling of 320121011 in words is "three hundred twenty million, one hundred twenty-one thousand, eleven".