42871211970721 has 2 divisors, whose sum is σ = 42871211970722. Its totient is φ = 42871211970720.

The previous prime is 42871211970673. The next prime is 42871211970773. The reversal of 42871211970721 is 12707911217824.

It is an a-pointer prime, because the next prime (42871211970773) can be obtained adding 42871211970721 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33635812530321 + 9235399440400 = 5799639^2 + 3038980^2 .

It is a cyclic number.

It is not a de Polignac number, because 42871211970721 - 2⁷ = 42871211970593 is a prime.

It is a super-2 number, since 2×42871211970721² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42871215970721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21435605985360 + 21435605985361.

It is an arithmetic number, because the mean of its divisors is an integer number (21435605985361).

Almost surely, 2^{42871211970721} is an apocalyptic number.

It is an amenable number.

42871211970721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42871211970721 is an equidigital number, since it uses as much as digits as its factorization.

42871211970721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 52.

The spelling of 42871211970721 in words is "forty-two trillion, eight hundred seventy-one billion, two hundred eleven million, nine hundred seventy thousand, seven hundred twenty-one".