1028337421 has 4 divisors (see below), whose sum is σ = 1028837952. Its totient is φ = 1027836892.

The previous prime is 1028337397. The next prime is 1028337473. The reversal of 1028337421 is 1247338201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1247338201 = 19 ⋅65649379.

It is a cyclic number.

It is not a de Polignac number, because 1028337421 - 2⁹ = 1028336909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028337221) 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 in 3 ways as a sum of consecutive naturals, for example, 247171 + ... + 251296.

It is an arithmetic number, because the mean of its divisors is an integer number (257209488).

Almost surely, 2^1028337421 is an apocalyptic number.

It is an amenable number.

1028337421 is a deficient number, since it is larger than the sum of its proper divisors (500531).

1028337421 is an equidigital number, since it uses as much as digits as its factorization.

1028337421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500530.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 1028337421 is about 32067.7005879748. The cubic root of 1028337421 is about 1009.3579623767.

The spelling of 1028337421 in words is "one billion, twenty-eight million, three hundred thirty-seven thousand, four hundred twenty-one".