1021300421 has 2 divisors, whose sum is σ = 1021300422. Its totient is φ = 1021300420.

The previous prime is 1021300417. The next prime is 1021300433. The reversal of 1021300421 is 1240031201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995402500 + 25897921 = 31550^2 + 5089^2 .

It is an emirp because it is prime and its reverse (1240031201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021300421 - 2² = 1021300417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021300396 and 1021300405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021300411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510650210 + 510650211.

It is an arithmetic number, because the mean of its divisors is an integer number (510650211).

Almost surely, 2^1021300421 is an apocalyptic number.

It is an amenable number.

1021300421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021300421 is an equidigital number, since it uses as much as digits as its factorization.

1021300421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1021300421 is about 31957.7912409478. The cubic root of 1021300421 is about 1007.0503165532.

Adding to 1021300421 its reverse (1240031201), we get a palindrome (2261331622).

The spelling of 1021300421 in words is "one billion, twenty-one million, three hundred thousand, four hundred twenty-one".