1004140021 has 4 divisors (see below), whose sum is σ = 1011805344. Its totient is φ = 996474700.

The previous prime is 1004140019. The next prime is 1004140043. The reversal of 1004140021 is 1200414001.

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: 1200414001 = 2657 ⋅451793.

It is a cyclic number.

It is not a de Polignac number, because 1004140021 - 2¹ = 1004140019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1004139983 and 1004140010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004140001) 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, 3832465 + ... + 3832726.

It is an arithmetic number, because the mean of its divisors is an integer number (252951336).

Almost surely, 2^1004140021 is an apocalyptic number.

It is an amenable number.

1004140021 is a deficient number, since it is larger than the sum of its proper divisors (7665323).

1004140021 is an equidigital number, since it uses as much as digits as its factorization.

1004140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7665322.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1004140021 is about 31688.1684702666. The cubic root of 1004140021 is about 1001.3781069488.

Adding to 1004140021 its reverse (1200414001), we get a palindrome (2204554022).

The spelling of 1004140021 in words is "one billion, four million, one hundred forty thousand, twenty-one".