28232404121 has 2 divisors, whose sum is σ = 28232404122. Its totient is φ = 28232404120.

The previous prime is 28232404087. The next prime is 28232404127. The reversal of 28232404121 is 12140423282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15341299600 + 12891104521 = 123860^2 + 113539^2 .

It is a cyclic number.

It is not a de Polignac number, because 28232404121 - 2³⁴ = 11052534937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28232404127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14116202060 + 14116202061.

It is an arithmetic number, because the mean of its divisors is an integer number (14116202061).

Almost surely, 2^28232404121 is an apocalyptic number.

It is an amenable number.

28232404121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28232404121 is an equidigital number, since it uses as much as digits as its factorization.

28232404121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 29.

The spelling of 28232404121 in words is "twenty-eight billion, two hundred thirty-two million, four hundred four thousand, one hundred twenty-one".