28275965021 has 2 divisors, whose sum is σ = 28275965022. Its totient is φ = 28275965020.

The previous prime is 28275965017. The next prime is 28275965083. The reversal of 28275965021 is 12056957282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25801996900 + 2473968121 = 160630^2 + 49739^2 .

It is a cyclic number.

It is not a de Polignac number, because 28275965021 - 2² = 28275965017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28275965321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14137982510 + 14137982511.

It is an arithmetic number, because the mean of its divisors is an integer number (14137982511).

Almost surely, 2^28275965021 is an apocalyptic number.

It is an amenable number.

28275965021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28275965021 is an equidigital number, since it uses as much as digits as its factorization.

28275965021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 28275965021 in words is "twenty-eight billion, two hundred seventy-five million, nine hundred sixty-five thousand, twenty-one".