1210121321 has 2 divisors, whose sum is σ = 1210121322. Its totient is φ = 1210121320.

The previous prime is 1210121317. The next prime is 1210121327. The reversal of 1210121321 is 1231210121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1180266025 + 29855296 = 34355^2 + 5464^2 .

It is an emirp because it is prime and its reverse (1231210121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210121321 - 2² = 1210121317 is a prime.

It is a super-2 number, since 2×1210121321² = 2928787223077570082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1210121296 and 1210121305.

It is not a weakly prime, because it can be changed into another prime (1210121327) 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, 605060660 + 605060661.

It is an arithmetic number, because the mean of its divisors is an integer number (605060661).

Almost surely, 2^1210121321 is an apocalyptic number.

It is an amenable number.

1210121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210121321 is an equidigital number, since it uses as much as digits as its factorization.

1210121321 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 14.

The square root of 1210121321 is about 34786.7980849057. The cubic root of 1210121321 is about 1065.6378498819.

Adding to 1210121321 its reverse (1231210121), we get a palindrome (2441331442).

The spelling of 1210121321 in words is "one billion, two hundred ten million, one hundred twenty-one thousand, three hundred twenty-one".