1210421321 has 2 divisors, whose sum is σ = 1210421322. Its totient is φ = 1210421320.

The previous prime is 1210421297. The next prime is 1210421323. The reversal of 1210421321 is 1231240121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 927811600 + 282609721 = 30460^2 + 16811^2 .

It is an emirp because it is prime and its reverse (1231240121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210421321 - 2³⁰ = 136679497 is a prime.

Together with 1210421323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210421321.

It is not a weakly prime, because it can be changed into another prime (1210421323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605210660 + 605210661.

It is an arithmetic number, because the mean of its divisors is an integer number (605210661).

Almost surely, 2^1210421321 is an apocalyptic number.

It is an amenable number.

1210421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210421321 is an equidigital number, since it uses as much as digits as its factorization.

1210421321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1210421321 is about 34791.1097983379. The cubic root of 1210421321 is about 1065.7259030203.

Adding to 1210421321 its reverse (1231240121), we get a palindrome (2441661442).

The spelling of 1210421321 in words is "one billion, two hundred ten million, four hundred twenty-one thousand, three hundred twenty-one".