42042323120981 has 2 divisors, whose sum is σ = 42042323120982. Its totient is φ = 42042323120980.

The previous prime is 42042323120947. The next prime is 42042323121017. The reversal of 42042323120981 is 18902132324024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41959172208100 + 83150912881 = 6477590^2 + 288359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42042323120981 is a prime.

It is a super-2 number, since 2×42042323120981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42042323120881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021161560490 + 21021161560491.

It is an arithmetic number, because the mean of its divisors is an integer number (21021161560491).

Almost surely, 2^{42042323120981} is an apocalyptic number.

It is an amenable number.

42042323120981 is a deficient number, since it is larger than the sum of its proper divisors (1).

42042323120981 is an equidigital number, since it uses as much as digits as its factorization.

42042323120981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 42042323120981 in words is "forty-two trillion, forty-two billion, three hundred twenty-three million, one hundred twenty thousand, nine hundred eighty-one".