1020430421 has 2 divisors, whose sum is σ = 1020430422. Its totient is φ = 1020430420.

The previous prime is 1020430381. The next prime is 1020430447. The reversal of 1020430421 is 1240340201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1010349796 + 10080625 = 31786^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020430421 - 2⁶ = 1020430357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020430421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020430471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510215210 + 510215211.

It is an arithmetic number, because the mean of its divisors is an integer number (510215211).

Almost surely, 2^1020430421 is an apocalyptic number.

It is an amenable number.

1020430421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020430421 is an equidigital number, since it uses as much as digits as its factorization.

1020430421 is an evil number, because the sum of its binary digits is even.

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

The square root of 1020430421 is about 31944.1766367518. The cubic root of 1020430421 is about 1006.7642816593.

Adding to 1020430421 its reverse (1240340201), we get a palindrome (2260770622).

The spelling of 1020430421 in words is "one billion, twenty million, four hundred thirty thousand, four hundred twenty-one".