1020243421 has 2 divisors, whose sum is σ = 1020243422. Its totient is φ = 1020243420.

The previous prime is 1020243409. The next prime is 1020243431. The reversal of 1020243421 is 1243420201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 761484025 + 258759396 = 27595^2 + 16086^2 .

It is an emirp because it is prime and its reverse (1243420201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020243421 - 2⁷ = 1020243293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020243431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510121710 + 510121711.

It is an arithmetic number, because the mean of its divisors is an integer number (510121711).

Almost surely, 2^1020243421 is an apocalyptic number.

It is an amenable number.

1020243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020243421 is an equidigital number, since it uses as much as digits as its factorization.

1020243421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1020243421 is about 31941.2495215826. The cubic root of 1020243421 is about 1006.7027793696.

Adding to 1020243421 its reverse (1243420201), we get a palindrome (2263663622).

The spelling of 1020243421 in words is "one billion, twenty million, two hundred forty-three thousand, four hundred twenty-one".