28020846121 has 2 divisors, whose sum is σ = 28020846122. Its totient is φ = 28020846120.

The previous prime is 28020846101. The next prime is 28020846127. The reversal of 28020846121 is 12164802082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21553469721 + 6467376400 = 146811^2 + 80420^2 .

It is a cyclic number.

It is not a de Polignac number, because 28020846121 - 2⁵ = 28020846089 is a prime.

It is not a weakly prime, because it can be changed into another prime (28020846127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14010423060 + 14010423061.

It is an arithmetic number, because the mean of its divisors is an integer number (14010423061).

Almost surely, 2^28020846121 is an apocalyptic number.

It is an amenable number.

28020846121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28020846121 is an equidigital number, since it uses as much as digits as its factorization.

28020846121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 34.

The spelling of 28020846121 in words is "twenty-eight billion, twenty million, eight hundred forty-six thousand, one hundred twenty-one".