43401421301261 has 2 divisors, whose sum is σ = 43401421301262. Its totient is φ = 43401421301260.

The previous prime is 43401421301207. The next prime is 43401421301263. The reversal of 43401421301261 is 16210312410434.

43401421301261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35982302175625 + 7419119125636 = 5998525^2 + 2723806^2 .

It is a cyclic number.

It is not a de Polignac number, because 43401421301261 - 2⁴² = 39003374790157 is a prime.

Together with 43401421301263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43401421301263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21700710650630 + 21700710650631.

It is an arithmetic number, because the mean of its divisors is an integer number (21700710650631).

Almost surely, 2^{43401421301261} is an apocalyptic number.

It is an amenable number.

43401421301261 is a deficient number, since it is larger than the sum of its proper divisors (1).

43401421301261 is an equidigital number, since it uses as much as digits as its factorization.

43401421301261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

Adding to 43401421301261 its reverse (16210312410434), we get a palindrome (59611733711695).

The spelling of 43401421301261 in words is "forty-three trillion, four hundred one billion, four hundred twenty-one million, three hundred one thousand, two hundred sixty-one".