1213321010281 has 2 divisors, whose sum is σ = 1213321010282. Its totient is φ = 1213321010280.

The previous prime is 1213321010273. The next prime is 1213321010323. The reversal of 1213321010281 is 1820101233121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032440920281 + 180880090000 = 1016091^2 + 425300^2 .

It is an emirp because it is prime and its reverse (1820101233121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213321010281 - 2³ = 1213321010273 is a prime.

It is a super-2 number, since 2×1213321010281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213321010201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606660505140 + 606660505141.

It is an arithmetic number, because the mean of its divisors is an integer number (606660505141).

Almost surely, 2^{1213321010281} is an apocalyptic number.

It is an amenable number.

1213321010281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213321010281 is an equidigital number, since it uses as much as digits as its factorization.

1213321010281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 1213321010281 in words is "one trillion, two hundred thirteen billion, three hundred twenty-one million, ten thousand, two hundred eighty-one".