28341684221 has 4 divisors (see below), whose sum is σ = 28740862944. Its totient is φ = 27942505500.

The previous prime is 28341684209. The next prime is 28341684247. The reversal of 28341684221 is 12248614382.

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.

It is a cyclic number.

It is not a de Polignac number, because 28341684221 - 2³⁴ = 11161815037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28341689221) 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, 199589255 + ... + 199589396.

It is an arithmetic number, because the mean of its divisors is an integer number (7185215736).

Almost surely, 2^28341684221 is an apocalyptic number.

It is an amenable number.

28341684221 is a deficient number, since it is larger than the sum of its proper divisors (399178723).

28341684221 is an equidigital number, since it uses as much as digits as its factorization.

28341684221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399178722.

The product of its digits is 147456, while the sum is 41.

The spelling of 28341684221 in words is "twenty-eight billion, three hundred forty-one million, six hundred eighty-four thousand, two hundred twenty-one".