12121496729 has 2 divisors, whose sum is σ = 12121496730. Its totient is φ = 12121496728.

The previous prime is 12121496677. The next prime is 12121496741. The reversal of 12121496729 is 92769412121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11873371225 + 248125504 = 108965^2 + 15752^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121496729 - 2²⁸ = 11853061273 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12121496729.

It is not a weakly prime, because it can be changed into another prime (12121496029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060748364 + 6060748365.

It is an arithmetic number, because the mean of its divisors is an integer number (6060748365).

Almost surely, 2^12121496729 is an apocalyptic number.

It is an amenable number.

12121496729 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121496729 is an equidigital number, since it uses as much as digits as its factorization.

12121496729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

It can be divided in two parts, 1212 and 1496729, that added together give a palindrome (1497941).

The spelling of 12121496729 in words is "twelve billion, one hundred twenty-one million, four hundred ninety-six thousand, seven hundred twenty-nine".