1013320221281 has 2 divisors, whose sum is σ = 1013320221282. Its totient is φ = 1013320221280.

The previous prime is 1013320221253. The next prime is 1013320221283. The reversal of 1013320221281 is 1821220233101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 651223176256 + 362097045025 = 806984^2 + 601745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013320221281 - 2¹⁸ = 1013319959137 is a prime.

It is a super-2 number, since 2×1013320221281² (a number of 25 digits) contains 22 as substring.

Together with 1013320221283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1013320221281.

It is not a weakly prime, because it can be changed into another prime (1013320221283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506660110640 + 506660110641.

It is an arithmetic number, because the mean of its divisors is an integer number (506660110641).

Almost surely, 2^{1013320221281} is an apocalyptic number.

It is an amenable number.

1013320221281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013320221281 is an equidigital number, since it uses as much as digits as its factorization.

1013320221281 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 26.

Adding to 1013320221281 its reverse (1821220233101), we get a palindrome (2834540454382).

The spelling of 1013320221281 in words is "one trillion, thirteen billion, three hundred twenty million, two hundred twenty-one thousand, two hundred eighty-one".