1020243121 has 2 divisors, whose sum is σ = 1020243122. Its totient is φ = 1020243120.

The previous prime is 1020243097. The next prime is 1020243157. The reversal of 1020243121 is 1213420201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917423521 + 102819600 = 30289^2 + 10140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020243121 - 2²¹ = 1018145969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020243095 and 1020243104.

It is not a weakly prime, because it can be changed into another prime (1020243421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510121560 + 510121561.

It is an arithmetic number, because the mean of its divisors is an integer number (510121561).

Almost surely, 2^1020243121 is an apocalyptic number.

It is an amenable number.

1020243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020243121 is an equidigital number, since it uses as much as digits as its factorization.

1020243121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1020243121 is about 31941.2448254604. The cubic root of 1020243121 is about 1006.7026806968.

Adding to 1020243121 its reverse (1213420201), we get a palindrome (2233663322).

The spelling of 1020243121 in words is "one billion, twenty million, two hundred forty-three thousand, one hundred twenty-one".