43212340261 has 2 divisors, whose sum is σ = 43212340262. Its totient is φ = 43212340260.

The previous prime is 43212340211. The next prime is 43212340277. The reversal of 43212340261 is 16204321234.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27710596225 + 15501744036 = 166465^2 + 124506^2 .

It is a cyclic number.

It is not a de Polignac number, because 43212340261 - 2²⁹ = 42675469349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43212340201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21606170130 + 21606170131.

It is an arithmetic number, because the mean of its divisors is an integer number (21606170131).

Almost surely, 2^43212340261 is an apocalyptic number.

It is an amenable number.

43212340261 is a deficient number, since it is larger than the sum of its proper divisors (1).

43212340261 is an equidigital number, since it uses as much as digits as its factorization.

43212340261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 43212340261 its reverse (16204321234), we get a palindrome (59416661495).

The spelling of 43212340261 in words is "forty-three billion, two hundred twelve million, three hundred forty thousand, two hundred sixty-one".