28231480421 has 2 divisors, whose sum is σ = 28231480422. Its totient is φ = 28231480420.

The previous prime is 28231480397. The next prime is 28231480463. The reversal of 28231480421 is 12408413282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14379367396 + 13852113025 = 119914^2 + 117695^2 .

It is a cyclic number.

It is not a de Polignac number, because 28231480421 - 2⁶ = 28231480357 is a prime.

It is a super-2 number, since 2×28231480421² (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 (28231480481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14115740210 + 14115740211.

It is an arithmetic number, because the mean of its divisors is an integer number (14115740211).

Almost surely, 2^28231480421 is an apocalyptic number.

It is an amenable number.

28231480421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28231480421 is an equidigital number, since it uses as much as digits as its factorization.

28231480421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 35.

The spelling of 28231480421 in words is "twenty-eight billion, two hundred thirty-one million, four hundred eighty thousand, four hundred twenty-one".