1004900021 has 2 divisors, whose sum is σ = 1004900022. Its totient is φ = 1004900020.

The previous prime is 1004900011. The next prime is 1004900027. The reversal of 1004900021 is 1200094001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 511438225 + 493461796 = 22615^2 + 22214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1004900021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1004900027) 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 as a sum of consecutive naturals, namely, 502450010 + 502450011.

It is an arithmetic number, because the mean of its divisors is an integer number (502450011).

Almost surely, 2^1004900021 is an apocalyptic number.

It is an amenable number.

1004900021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1004900021 is an equidigital number, since it uses as much as digits as its factorization.

1004900021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1004900021 is about 31700.1580595429. The cubic root of 1004900021 is about 1001.6306797714.

Adding to 1004900021 its reverse (1200094001), we get a palindrome (2204994022).

The spelling of 1004900021 in words is "one billion, four million, nine hundred thousand, twenty-one".