42144230021917 has 2 divisors, whose sum is σ = 42144230021918. Its totient is φ = 42144230021916.

The previous prime is 42144230021911. The next prime is 42144230022031. The reversal of 42144230021917 is 71912003244124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22263430675396 + 19880799346521 = 4718414^2 + 4458789^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144230021917 - 2²³ = 42144221633309 is a prime.

It is a super-2 number, since 2×42144230021917² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42144230021917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42144230021911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21072115010958 + 21072115010959.

It is an arithmetic number, because the mean of its divisors is an integer number (21072115010959).

Almost surely, 2^{42144230021917} is an apocalyptic number.

It is an amenable number.

42144230021917 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144230021917 is an equidigital number, since it uses as much as digits as its factorization.

42144230021917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 42144230021917 in words is "forty-two trillion, one hundred forty-four billion, two hundred thirty million, twenty-one thousand, nine hundred seventeen".