1004500021 has 4 divisors (see below), whose sum is σ = 1148000032. Its totient is φ = 861000012.

The previous prime is 1004499971. The next prime is 1004500033. The reversal of 1004500021 is 1200054001.

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: 1200054001 = 547 ⋅2193883.

It is a cyclic number.

It is not a de Polignac number, because 1004500021 - 2²⁹ = 467629109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1004499974 and 1004500010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004500421) 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, 71749995 + ... + 71750008.

It is an arithmetic number, because the mean of its divisors is an integer number (287000008).

Almost surely, 2^1004500021 is an apocalyptic number.

It is an amenable number.

1004500021 is a deficient number, since it is larger than the sum of its proper divisors (143500011).

1004500021 is an equidigital number, since it uses as much as digits as its factorization.

1004500021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143500010.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1004500021 is about 31693.8483147755. The cubic root of 1004500021 is about 1001.4977625873.

Adding to 1004500021 its reverse (1200054001), we get a palindrome (2204554022).

The spelling of 1004500021 in words is "one billion, four million, five hundred thousand, twenty-one".