1066305421 has 4 divisors (see below), whose sum is σ = 1066372092. Its totient is φ = 1066238752.

The previous prime is 1066305349. The next prime is 1066305439. The reversal of 1066305421 is 1245036601.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 975312900 + 90992521 = 31230^2 + 9539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066305421 - 2⁷ = 1066305293 is a prime.

It is a super-2 number, since 2×1066305421² = 2274014501707974482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1066305421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066305451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615 + ... + 46651.

It is an arithmetic number, because the mean of its divisors is an integer number (266593023).

Almost surely, 2^1066305421 is an apocalyptic number.

It is an amenable number.

1066305421 is a deficient number, since it is larger than the sum of its proper divisors (66671).

1066305421 is an equidigital number, since it uses as much as digits as its factorization.

1066305421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66670.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1066305421 is about 32654.3323465662. The cubic root of 1066305421 is about 1021.6305526838.

The spelling of 1066305421 in words is "one billion, sixty-six million, three hundred five thousand, four hundred twenty-one".