1210001321 has 2 divisors, whose sum is σ = 1210001322. Its totient is φ = 1210001320.

The previous prime is 1210001291. The next prime is 1210001327. The reversal of 1210001321 is 1231000121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856147600 + 353853721 = 29260^2 + 18811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210001321 - 2²² = 1205807017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210001327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605000660 + 605000661.

It is an arithmetic number, because the mean of its divisors is an integer number (605000661).

Almost surely, 2^1210001321 is an apocalyptic number.

It is an amenable number.

1210001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210001321 is an equidigital number, since it uses as much as digits as its factorization.

1210001321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1210001321 is about 34785.0732498869. The cubic root of 1210001321 is about 1065.6026245517.

Adding to 1210001321 its reverse (1231000121), we get a palindrome (2441001442).

The spelling of 1210001321 in words is "one billion, two hundred ten million, one thousand, three hundred twenty-one".