1212041321 has 2 divisors, whose sum is σ = 1212041322. Its totient is φ = 1212041320.

The previous prime is 1212041291. The next prime is 1212041357. The reversal of 1212041321 is 1231402121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998560000 + 213481321 = 31600^2 + 14611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212041321 is a prime.

It is a super-2 number, since 2×1212041321² = 2938088327622850082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212041321.

It is not a weakly prime, because it can be changed into another prime (1212041381) 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, 606020660 + 606020661.

It is an arithmetic number, because the mean of its divisors is an integer number (606020661).

Almost surely, 2^1212041321 is an apocalyptic number.

It is an amenable number.

1212041321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212041321 is an equidigital number, since it uses as much as digits as its factorization.

1212041321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1212041321 is about 34814.3838233567. The cubic root of 1212041321 is about 1066.2011387309.

Adding to 1212041321 its reverse (1231402121), we get a palindrome (2443443442).

The spelling of 1212041321 in words is "one billion, two hundred twelve million, forty-one thousand, three hundred twenty-one".