12840969121 has 2 divisors, whose sum is σ = 12840969122. Its totient is φ = 12840969120.

The previous prime is 12840969107. The next prime is 12840969133. The reversal of 12840969121 is 12196904821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8914192225 + 3926776896 = 94415^2 + 62664^2 .

It is a cyclic number.

It is not a de Polignac number, because 12840969121 - 2⁷ = 12840968993 is a prime.

It is not a weakly prime, because it can be changed into another prime (12840969821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420484560 + 6420484561.

It is an arithmetic number, because the mean of its divisors is an integer number (6420484561).

Almost surely, 2^12840969121 is an apocalyptic number.

It is an amenable number.

12840969121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840969121 is an equidigital number, since it uses as much as digits as its factorization.

12840969121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 12840969121 in words is "twelve billion, eight hundred forty million, nine hundred sixty-nine thousand, one hundred twenty-one".