28421011 has 2 divisors, whose sum is σ = 28421012. Its totient is φ = 28421010.

The previous prime is 28420999. The next prime is 28421021. The reversal of 28421011 is 11012482.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28421011 - 2⁷ = 28420883 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28421011.

It is not a weakly prime, because it can be changed into another prime (28421021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14210505 + 14210506.

It is an arithmetic number, because the mean of its divisors is an integer number (14210506).

Almost surely, 2^28421011 is an apocalyptic number.

28421011 is a deficient number, since it is larger than the sum of its proper divisors (1).

28421011 is an equidigital number, since it uses as much as digits as its factorization.

28421011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 28421011 is about 5331.1359952640. The cubic root of 28421011 is about 305.1732814497.

Adding to 28421011 its reverse (11012482), we get a palindrome (39433493).

The spelling of 28421011 in words is "twenty-eight million, four hundred twenty-one thousand, eleven".