1021031320121 has 2 divisors, whose sum is σ = 1021031320122. Its totient is φ = 1021031320120.

The previous prime is 1021031320039. The next prime is 1021031320129. The reversal of 1021031320121 is 1210231301201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1017403064896 + 3628255225 = 1008664^2 + 60235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021031320121 - 2¹⁰ = 1021031319097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021031320121.

It is not a weakly prime, because it can be changed into another prime (1021031320129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510515660060 + 510515660061.

It is an arithmetic number, because the mean of its divisors is an integer number (510515660061).

Almost surely, 2^{1021031320121} is an apocalyptic number.

It is an amenable number.

1021031320121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021031320121 is an equidigital number, since it uses as much as digits as its factorization.

1021031320121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1021031320121 its reverse (1210231301201), we get a palindrome (2231262621322).

The spelling of 1021031320121 in words is "one trillion, twenty-one billion, thirty-one million, three hundred twenty thousand, one hundred twenty-one".