16201262321 has 4 divisors (see below), whose sum is σ = 16204589172. Its totient is φ = 16197935472.

The previous prime is 16201262317. The next prime is 16201262347. The reversal of 16201262321 is 12326210261.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9198919921 + 7002342400 = 95911^2 + 83680^2 .

It is a cyclic number.

It is not a de Polignac number, because 16201262321 - 2² = 16201262317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16201262921) 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, 1656110 + ... + 1665863.

It is an arithmetic number, because the mean of its divisors is an integer number (4051147293).

Almost surely, 2^16201262321 is an apocalyptic number.

It is an amenable number.

16201262321 is a deficient number, since it is larger than the sum of its proper divisors (3326851).

16201262321 is an equidigital number, since it uses as much as digits as its factorization.

16201262321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326850.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 16201262321 its reverse (12326210261), we get a palindrome (28527472582).

The spelling of 16201262321 in words is "sixteen billion, two hundred one million, two hundred sixty-two thousand, three hundred twenty-one".