1021120013 has 2 divisors, whose sum is σ = 1021120014. Its totient is φ = 1021120012.

The previous prime is 1021119973. The next prime is 1021120031. The reversal of 1021120013 is 3100211201.

Together with next prime (1021120031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 924038404 + 97081609 = 30398^2 + 9853^2 .

It is an emirp because it is prime and its reverse (3100211201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021120013 - 2⁶ = 1021119949 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 = 1021119976 and 1021120003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021120813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510560006 + 510560007.

It is an arithmetic number, because the mean of its divisors is an integer number (510560007).

Almost surely, 2^1021120013 is an apocalyptic number.

It is an amenable number.

1021120013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021120013 is an equidigital number, since it uses as much as digits as its factorization.

1021120013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1021120013 is about 31954.9685182133. The cubic root of 1021120013 is about 1006.9910161331.

Adding to 1021120013 its reverse (3100211201), we get a palindrome (4121331214).

The spelling of 1021120013 in words is "one billion, twenty-one million, one hundred twenty thousand, thirteen".