12739495121 has 2 divisors, whose sum is σ = 12739495122. Its totient is φ = 12739495120.

The previous prime is 12739495103. The next prime is 12739495129. The reversal of 12739495121 is 12159493721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12624769600 + 114725521 = 112360^2 + 10711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12739495121 is a prime.

It is not a weakly prime, because it can be changed into another prime (12739495129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6369747560 + 6369747561.

It is an arithmetic number, because the mean of its divisors is an integer number (6369747561).

Almost surely, 2^12739495121 is an apocalyptic number.

It is an amenable number.

12739495121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12739495121 is an equidigital number, since it uses as much as digits as its factorization.

12739495121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The spelling of 12739495121 in words is "twelve billion, seven hundred thirty-nine million, four hundred ninety-five thousand, one hundred twenty-one".