16128292321 has 4 divisors (see below), whose sum is σ = 16332448000. Its totient is φ = 15924136644.

The previous prime is 16128292307. The next prime is 16128292331. The reversal of 16128292321 is 12329282161.

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 16128292321 - 2⁵ = 16128292289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16128292331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102077721 + ... + 102077878.

It is an arithmetic number, because the mean of its divisors is an integer number (4083112000).

Almost surely, 2^16128292321 is an apocalyptic number.

It is an amenable number.

16128292321 is a deficient number, since it is larger than the sum of its proper divisors (204155679).

16128292321 is an equidigital number, since it uses as much as digits as its factorization.

16128292321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204155678.

The product of its digits is 20736, while the sum is 37.

The spelling of 16128292321 in words is "sixteen billion, one hundred twenty-eight million, two hundred ninety-two thousand, three hundred twenty-one".