1210031000221 has 2 divisors, whose sum is σ = 1210031000222. Its totient is φ = 1210031000220.

The previous prime is 1210031000219. The next prime is 1210031000237. The reversal of 1210031000221 is 1220001300121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073233840900 + 136797159321 = 1035970^2 + 369861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210031000221 - 2¹ = 1210031000219 is a prime.

Together with 1210031000219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210031000621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605015500110 + 605015500111.

It is an arithmetic number, because the mean of its divisors is an integer number (605015500111).

Almost surely, 2^{1210031000221} is an apocalyptic number.

It is an amenable number.

1210031000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210031000221 is an equidigital number, since it uses as much as digits as its factorization.

1210031000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1210031000221 its reverse (1220001300121), we get a palindrome (2430032300342).

The spelling of 1210031000221 in words is "one trillion, two hundred ten billion, thirty-one million, two hundred twenty-one", and thus it is an aban number.