28016076284921 has 2 divisors, whose sum is σ = 28016076284922. Its totient is φ = 28016076284920.

The previous prime is 28016076284881. The next prime is 28016076284947. The reversal of 28016076284921 is 12948267061082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17565151566400 + 10450924718521 = 4191080^2 + 3232789^2 .

It is a cyclic number.

It is not a de Polignac number, because 28016076284921 - 2¹⁸ = 28016076022777 is a prime.

It is a super-2 number, since 2×28016076284921² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28016076284621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14008038142460 + 14008038142461.

It is an arithmetic number, because the mean of its divisors is an integer number (14008038142461).

Almost surely, 2^{28016076284921} is an apocalyptic number.

It is an amenable number.

28016076284921 is a deficient number, since it is larger than the sum of its proper divisors (1).

28016076284921 is an equidigital number, since it uses as much as digits as its factorization.

28016076284921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 28016076284921 in words is "twenty-eight trillion, sixteen billion, seventy-six million, two hundred eighty-four thousand, nine hundred twenty-one".