28300379021 has 2 divisors, whose sum is σ = 28300379022. Its totient is φ = 28300379020.

The previous prime is 28300378999. The next prime is 28300379047. The reversal of 28300379021 is 12097300382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25787863396 + 2512515625 = 160586^2 + 50125^2 .

It is a cyclic number.

It is not a de Polignac number, because 28300379021 - 2³⁰ = 27226637197 is a prime.

It is a super-2 number, since 2×28300379021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28300379071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14150189510 + 14150189511.

It is an arithmetic number, because the mean of its divisors is an integer number (14150189511).

Almost surely, 2^28300379021 is an apocalyptic number.

It is an amenable number.

28300379021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28300379021 is an equidigital number, since it uses as much as digits as its factorization.

28300379021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 28300379021 in words is "twenty-eight billion, three hundred million, three hundred seventy-nine thousand, twenty-one".