1021320213253 has 2 divisors, whose sum is σ = 1021320213254. Its totient is φ = 1021320213252.

The previous prime is 1021320213247. The next prime is 1021320213283. The reversal of 1021320213253 is 3523120231201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629647011009 + 391673202244 = 793503^2 + 625838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021320213253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021320213283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510660106626 + 510660106627.

It is an arithmetic number, because the mean of its divisors is an integer number (510660106627).

Almost surely, 2^{1021320213253} is an apocalyptic number.

It is an amenable number.

1021320213253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021320213253 is an equidigital number, since it uses as much as digits as its factorization.

1021320213253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 1021320213253 its reverse (3523120231201), we get a palindrome (4544440444454).

The spelling of 1021320213253 in words is "one trillion, twenty-one billion, three hundred twenty million, two hundred thirteen thousand, two hundred fifty-three".