1005420521 has 8 divisors (see below), whose sum is σ = 1151454720. Its totient is φ = 859987008.

The previous prime is 1005420503. The next prime is 1005420541. The reversal of 1005420521 is 1250245001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005420521 is a prime.

It is a super-2 number, since 2×1005420521² = 2021740848095822882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1005420493 and 1005420502.

It is not an unprimeable number, because it can be changed into a prime (1005420541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146576 + ... + 153281.

It is an arithmetic number, because the mean of its divisors is an integer number (143931840).

Almost surely, 2^1005420521 is an apocalyptic number.

It is an amenable number.

1005420521 is a deficient number, since it is larger than the sum of its proper divisors (146034199).

1005420521 is an equidigital number, since it uses as much as digits as its factorization.

1005420521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300343.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1005420521 is about 31708.3667349802. The cubic root of 1005420521 is about 1001.8035854572.

Adding to 1005420521 its reverse (1250245001), we get a palindrome (2255665522).

The spelling of 1005420521 in words is "one billion, five million, four hundred twenty thousand, five hundred twenty-one".