1020104021 has 4 divisors (see below), whose sum is σ = 1025282412. Its totient is φ = 1014925632.

The previous prime is 1020104003. The next prime is 1020104039. The reversal of 1020104021 is 1204010201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1020104003) and next prime (1020104039).

It can be written as a sum of positive squares in 2 ways, for example, as 1005777796 + 14326225 = 31714^2 + 3785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020104021 is a prime.

It is a super-2 number, since 2×1020104021² = 2081224427320736882, 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 = 1020103993 and 1020104011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020104821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2588900 + ... + 2589293.

It is an arithmetic number, because the mean of its divisors is an integer number (256320603).

Almost surely, 2^1020104021 is an apocalyptic number.

It is an amenable number.

1020104021 is a deficient number, since it is larger than the sum of its proper divisors (5178391).

1020104021 is an equidigital number, since it uses as much as digits as its factorization.

1020104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178390.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1020104021 is about 31939.0673157498. The cubic root of 1020104021 is about 1006.6569273188.

Adding to 1020104021 its reverse (1204010201), we get a palindrome (2224114222).

The spelling of 1020104021 in words is "one billion, twenty million, one hundred four thousand, twenty-one".