43677374117821 has 2 divisors, whose sum is σ = 43677374117822. Its totient is φ = 43677374117820.

The previous prime is 43677374117813. The next prime is 43677374117827. The reversal of 43677374117821 is 12871147377634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21917481555321 + 21759892562500 = 4681611^2 + 4664750^2 .

It is a cyclic number.

It is not a de Polignac number, because 43677374117821 - 2³ = 43677374117813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43677374117821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43677374117827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21838687058910 + 21838687058911.

It is an arithmetic number, because the mean of its divisors is an integer number (21838687058911).

Almost surely, 2^{43677374117821} is an apocalyptic number.

It is an amenable number.

43677374117821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43677374117821 is an equidigital number, since it uses as much as digits as its factorization.

43677374117821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33191424, while the sum is 61.

The spelling of 43677374117821 in words is "forty-three trillion, six hundred seventy-seven billion, three hundred seventy-four million, one hundred seventeen thousand, eight hundred twenty-one".