212726657729 has 2 divisors, whose sum is σ = 212726657730. Its totient is φ = 212726657728.

The previous prime is 212726657683. The next prime is 212726657743. The reversal of 212726657729 is 927756627212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148490769025 + 64235888704 = 385345^2 + 253448^2 .

It is a cyclic number.

It is not a de Polignac number, because 212726657729 - 2²⁰ = 212725609153 is a prime.

It is a super-2 number, since 2×212726657729² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212726657779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106363328864 + 106363328865.

It is an arithmetic number, because the mean of its divisors is an integer number (106363328865).

Almost surely, 2^212726657729 is an apocalyptic number.

It is an amenable number.

212726657729 is a deficient number, since it is larger than the sum of its proper divisors (1).

212726657729 is an equidigital number, since it uses as much as digits as its factorization.

212726657729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 56.

The spelling of 212726657729 in words is "two hundred twelve billion, seven hundred twenty-six million, six hundred fifty-seven thousand, seven hundred twenty-nine".