12346121521 has 2 divisors, whose sum is σ = 12346121522. Its totient is φ = 12346121520.

The previous prime is 12346121519. The next prime is 12346121537. The reversal of 12346121521 is 12512164321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10503995121 + 1842126400 = 102489^2 + 42920^2 .

It is a cyclic number.

It is not a de Polignac number, because 12346121521 - 2¹ = 12346121519 is a prime.

It is a super-2 number, since 2×12346121521² (a number of 21 digits) contains 22 as substring.

Together with 12346121519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12346121521.

It is not a weakly prime, because it can be changed into another prime (12346125521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6173060760 + 6173060761.

It is an arithmetic number, because the mean of its divisors is an integer number (6173060761).

Almost surely, 2^12346121521 is an apocalyptic number.

It is an amenable number.

12346121521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12346121521 is an equidigital number, since it uses as much as digits as its factorization.

12346121521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

Adding to 12346121521 its reverse (12512164321), we get a palindrome (24858285842).

The spelling of 12346121521 in words is "twelve billion, three hundred forty-six million, one hundred twenty-one thousand, five hundred twenty-one".