1020421310243 has 2 divisors, whose sum is σ = 1020421310244. Its totient is φ = 1020421310242.

The previous prime is 1020421310197. The next prime is 1020421310329. The reversal of 1020421310243 is 3420131240201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020421310243 - 2⁶ = 1020421310179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020421310143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510210655121 + 510210655122.

It is an arithmetic number, because the mean of its divisors is an integer number (510210655122).

Almost surely, 2^{1020421310243} is an apocalyptic number.

1020421310243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020421310243 is an equidigital number, since it uses as much as digits as its factorization.

1020421310243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1020421310243 its reverse (3420131240201), we get a palindrome (4440552550444).

The spelling of 1020421310243 in words is "one trillion, twenty billion, four hundred twenty-one million, three hundred ten thousand, two hundred forty-three".