1020498821 has 2 divisors, whose sum is σ = 1020498822. Its totient is φ = 1020498820.

The previous prime is 1020498803. The next prime is 1020498841. The reversal of 1020498821 is 1288940201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905709025 + 114789796 = 30095^2 + 10714^2 .

It is an emirp because it is prime and its reverse (1288940201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020498821 - 2¹⁸ = 1020236677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020498841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510249410 + 510249411.

It is an arithmetic number, because the mean of its divisors is an integer number (510249411).

Almost surely, 2^1020498821 is an apocalyptic number.

It is an amenable number.

1020498821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020498821 is an equidigital number, since it uses as much as digits as its factorization.

1020498821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1020498821 is about 31945.2472364826. The cubic root of 1020498821 is about 1006.7867758071.

The spelling of 1020498821 in words is "one billion, twenty million, four hundred ninety-eight thousand, eight hundred twenty-one".