121021211321 has 2 divisors, whose sum is σ = 121021211322. Its totient is φ = 121021211320.

The previous prime is 121021211317. The next prime is 121021211327. The reversal of 121021211321 is 123112120121.

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., 85077222400 + 35943988921 = 291680^2 + 189589^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021211321 - 2² = 121021211317 is a prime.

It is a super-2 number, since 2×121021211321² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121021211321.

It is not a weakly prime, because it can be changed into another prime (121021211327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510605660 + 60510605661.

It is an arithmetic number, because the mean of its divisors is an integer number (60510605661).

Almost surely, 2^121021211321 is an apocalyptic number.

It is an amenable number.

121021211321 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021211321 is an equidigital number, since it uses as much as digits as its factorization.

121021211321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121021211321 its reverse (123112120121), we get a palindrome (244133331442).

The spelling of 121021211321 in words is "one hundred twenty-one billion, twenty-one million, two hundred eleven thousand, three hundred twenty-one".