1004212021 has 4 divisors (see below), whose sum is σ = 1004588992. Its totient is φ = 1003835052.

The previous prime is 1004211991. The next prime is 1004212063. The reversal of 1004212021 is 1202124001.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1004212021 - 2¹³ = 1004203829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1004211992 and 1004212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004212421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184461 + ... + 189826.

It is an arithmetic number, because the mean of its divisors is an integer number (251147248).

Almost surely, 2^1004212021 is an apocalyptic number.

It is an amenable number.

1004212021 is a deficient number, since it is larger than the sum of its proper divisors (376971).

1004212021 is an equidigital number, since it uses as much as digits as its factorization.

1004212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376970.

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

The square root of 1004212021 is about 31689.3045206107. The cubic root of 1004212021 is about 1001.4020403641.

Adding to 1004212021 its reverse (1202124001), we get a palindrome (2206336022).

The spelling of 1004212021 in words is "one billion, four million, two hundred twelve thousand, twenty-one".