28272481421 has 2 divisors, whose sum is σ = 28272481422. Its totient is φ = 28272481420.

The previous prime is 28272481357. The next prime is 28272481423. The reversal of 28272481421 is 12418427282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20033288521 + 8239192900 = 141539^2 + 90770^2 .

It is a cyclic number.

It is not a de Polignac number, because 28272481421 - 2⁶ = 28272481357 is a prime.

Together with 28272481423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28272481423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14136240710 + 14136240711.

It is an arithmetic number, because the mean of its divisors is an integer number (14136240711).

Almost surely, 2^28272481421 is an apocalyptic number.

It is an amenable number.

28272481421 is a deficient number, since it is larger than the sum of its proper divisors (1).

28272481421 is an equidigital number, since it uses as much as digits as its factorization.

28272481421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114688, while the sum is 41.

The spelling of 28272481421 in words is "twenty-eight billion, two hundred seventy-two million, four hundred eighty-one thousand, four hundred twenty-one".