43001220129997 has 2 divisors, whose sum is σ = 43001220129998. Its totient is φ = 43001220129996.

The previous prime is 43001220129977. The next prime is 43001220130007. The reversal of 43001220129997 is 79992102210034.

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., 42580701601321 + 420518528676 = 6525389^2 + 648474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43001220129997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43001220129997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43001220129977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21500610064998 + 21500610064999.

It is an arithmetic number, because the mean of its divisors is an integer number (21500610064999).

Almost surely, 2^{43001220129997} is an apocalyptic number.

It is an amenable number.

43001220129997 is a deficient number, since it is larger than the sum of its proper divisors (1).

43001220129997 is an equidigital number, since it uses as much as digits as its factorization.

43001220129997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 43001220129997 in words is "forty-three trillion, one billion, two hundred twenty million, one hundred twenty-nine thousand, nine hundred ninety-seven".