1210231021 has 2 divisors, whose sum is σ = 1210231022. Its totient is φ = 1210231020.

The previous prime is 1210231019. The next prime is 1210231031. The reversal of 1210231021 is 1201320121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 985080996 + 225150025 = 31386^2 + 15005^2 .

It is an emirp because it is prime and its reverse (1201320121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210231021 - 2¹ = 1210231019 is a prime.

Together with 1210231019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1210230992 and 1210231010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210231031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605115510 + 605115511.

It is an arithmetic number, because the mean of its divisors is an integer number (605115511).

Almost surely, 2^1210231021 is an apocalyptic number.

It is an amenable number.

1210231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210231021 is an equidigital number, since it uses as much as digits as its factorization.

1210231021 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.

The square root of 1210231021 is about 34788.3747967622. The cubic root of 1210231021 is about 1065.6700496671.

Adding to 1210231021 its reverse (1201320121), we get a palindrome (2411551142).

The spelling of 1210231021 in words is "one billion, two hundred ten million, two hundred thirty-one thousand, twenty-one".