16073243221 has 4 divisors (see below), whose sum is σ = 18369420832. Its totient is φ = 13777065612.

The previous prime is 16073243183. The next prime is 16073243231. The reversal of 16073243221 is 12234237061.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12234237061 = 2693 ⋅4542977.

It is a cyclic number.

It is not a de Polignac number, because 16073243221 - 2⁹ = 16073242709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16073243231) 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, 1148088795 + ... + 1148088808.

It is an arithmetic number, because the mean of its divisors is an integer number (4592355208).

Almost surely, 2^16073243221 is an apocalyptic number.

It is an amenable number.

16073243221 is a deficient number, since it is larger than the sum of its proper divisors (2296177611).

16073243221 is an equidigital number, since it uses as much as digits as its factorization.

16073243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296177610.

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 16073243221 in words is "sixteen billion, seventy-three million, two hundred forty-three thousand, two hundred twenty-one".