1210011001321 has 2 divisors, whose sum is σ = 1210011001322. Its totient is φ = 1210011001320.

The previous prime is 1210011001319. The next prime is 1210011001373. The reversal of 1210011001321 is 1231001100121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210011000025 + 1296 = 1100005^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210011001321 - 2¹ = 1210011001319 is a prime.

Together with 1210011001319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1210011005321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605005500660 + 605005500661.

It is an arithmetic number, because the mean of its divisors is an integer number (605005500661).

Almost surely, 2^{1210011001321} is an apocalyptic number.

It is an amenable number.

1210011001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210011001321 is an equidigital number, since it uses as much as digits as its factorization.

1210011001321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1210011001321 its reverse (1231001100121), we get a palindrome (2441012101442).

The spelling of 1210011001321 in words is "one trillion, two hundred ten billion, eleven million, one thousand, three hundred twenty-one".