1221031010281 has 2 divisors, whose sum is σ = 1221031010282. Its totient is φ = 1221031010280.

The previous prime is 1221031010263. The next prime is 1221031010293. The reversal of 1221031010281 is 1820101301221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 711127904656 + 509903105625 = 843284^2 + 714075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221031010281 - 2⁵ = 1221031010249 is a prime.

It is a super-2 number, since 2×1221031010281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221031010201) 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, 610515505140 + 610515505141.

It is an arithmetic number, because the mean of its divisors is an integer number (610515505141).

Almost surely, 2^{1221031010281} is an apocalyptic number.

It is an amenable number.

1221031010281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221031010281 is an equidigital number, since it uses as much as digits as its factorization.

1221031010281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

The spelling of 1221031010281 in words is "one trillion, two hundred twenty-one billion, thirty-one million, ten thousand, two hundred eighty-one".