43134411721 has 2 divisors, whose sum is σ = 43134411722. Its totient is φ = 43134411720.

The previous prime is 43134411709. The next prime is 43134411731. The reversal of 43134411721 is 12711443134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42172729600 + 961682121 = 205360^2 + 31011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43134411721 is a prime.

It is not a weakly prime, because it can be changed into another prime (43134411731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21567205860 + 21567205861.

It is an arithmetic number, because the mean of its divisors is an integer number (21567205861).

Almost surely, 2^43134411721 is an apocalyptic number.

It is an amenable number.

43134411721 is a deficient number, since it is larger than the sum of its proper divisors (1).

43134411721 is an equidigital number, since it uses as much as digits as its factorization.

43134411721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

Adding to 43134411721 its reverse (12711443134), we get a palindrome (55845854855).

The spelling of 43134411721 in words is "forty-three billion, one hundred thirty-four million, four hundred eleven thousand, seven hundred twenty-one".