20101320321 has 8 divisors (see below), whose sum is σ = 26803660800. Its totient is φ = 13399930032.

The previous prime is 20101320289. The next prime is 20101320329. The reversal of 20101320321 is 12302310102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20101320321 - 2⁵ = 20101320289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20101320321.

It is not an unprimeable number, because it can be changed into a prime (20101320329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186625 + ... + 273918.

It is an arithmetic number, because the mean of its divisors is an integer number (3350457600).

Almost surely, 2^20101320321 is an apocalyptic number.

It is an amenable number.

20101320321 is a deficient number, since it is larger than the sum of its proper divisors (6702340479).

20101320321 is a wasteful number, since it uses less digits than its factorization.

20101320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475095.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20101320321 its reverse (12302310102), we get a palindrome (32403630423).

The spelling of 20101320321 in words is "twenty billion, one hundred one million, three hundred twenty thousand, three hundred twenty-one".