28107553421 has 2 divisors, whose sum is σ = 28107553422. Its totient is φ = 28107553420.

The previous prime is 28107553393. The next prime is 28107553457. The reversal of 28107553421 is 12435570182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23574224521 + 4533328900 = 153539^2 + 67330^2 .

It is a cyclic number.

It is not a de Polignac number, because 28107553421 - 2²⁶ = 28040444557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28107153421) 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, 14053776710 + 14053776711.

It is an arithmetic number, because the mean of its divisors is an integer number (14053776711).

Almost surely, 2^28107553421 is an apocalyptic number.

It is an amenable number.

28107553421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28107553421 is an equidigital number, since it uses as much as digits as its factorization.

28107553421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 28107553421 in words is "twenty-eight billion, one hundred seven million, five hundred fifty-three thousand, four hundred twenty-one".