11028421 has 2 divisors, whose sum is σ = 11028422. Its totient is φ = 11028420.

The previous prime is 11028419. The next prime is 11028443. The reversal of 11028421 is 12482011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10857025 + 171396 = 3295^2 + 414^2 .

It is an emirp because it is prime and its reverse (12482011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11028421 - 2¹ = 11028419 is a prime.

Together with 11028419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11028481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5514210 + 5514211.

It is an arithmetic number, because the mean of its divisors is an integer number (5514211).

Almost surely, 2^11028421 is an apocalyptic number.

It is an amenable number.

11028421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11028421 is an equidigital number, since it uses as much as digits as its factorization.

11028421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 11028421 is about 3320.9066533102. The cubic root of 11028421 is about 222.5893829326.

It can be divided in two parts, 11028 and 421, that added together give a square (11449 = 107²).

The spelling of 11028421 in words is "eleven million, twenty-eight thousand, four hundred twenty-one".