320006106521 has 4 divisors (see below), whose sum is σ = 336848533200. Its totient is φ = 303163679844.

The previous prime is 320006106491. The next prime is 320006106569. The reversal of 320006106521 is 125601600023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320006106521 - 2⁶ = 320006106457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320006156521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8421213311 + ... + 8421213348.

It is an arithmetic number, because the mean of its divisors is an integer number (84212133300).

Almost surely, 2^320006106521 is an apocalyptic number.

It is an amenable number.

320006106521 is a deficient number, since it is larger than the sum of its proper divisors (16842426679).

320006106521 is a wasteful number, since it uses less digits than its factorization.

320006106521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16842426678.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 320006106521 its reverse (125601600023), we get a palindrome (445607706544).

The spelling of 320006106521 in words is "three hundred twenty billion, six million, one hundred six thousand, five hundred twenty-one".