1020344021 has 2 divisors, whose sum is σ = 1020344022. Its totient is φ = 1020344020.

The previous prime is 1020343981. The next prime is 1020344089. The reversal of 1020344021 is 1204430201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 921122500 + 99221521 = 30350^2 + 9961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020344021 is a prime.

It is a super-2 number, since 2×1020344021² = 2082203842380896882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020344921) 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 as a sum of consecutive naturals, namely, 510172010 + 510172011.

It is an arithmetic number, because the mean of its divisors is an integer number (510172011).

Almost surely, 2^1020344021 is an apocalyptic number.

It is an amenable number.

1020344021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020344021 is an equidigital number, since it uses as much as digits as its factorization.

1020344021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1020344021 is about 31942.8242489608. The cubic root of 1020344021 is about 1006.7358665620.

Adding to 1020344021 its reverse (1204430201), we get a palindrome (2224774222).

The spelling of 1020344021 in words is "one billion, twenty million, three hundred forty-four thousand, twenty-one".