42442142101981 has 2 divisors, whose sum is σ = 42442142101982. Its totient is φ = 42442142101980.

The previous prime is 42442142101967. The next prime is 42442142102047. The reversal of 42442142101981 is 18910124124424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25063740576900 + 17378401525081 = 5006370^2 + 4168741^2 .

It is a cyclic number.

It is not a de Polignac number, because 42442142101981 - 2³⁷ = 42304703148509 is a prime.

It is a super-2 number, since 2×42442142101981² (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 (42442142101781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21221071050990 + 21221071050991.

It is an arithmetic number, because the mean of its divisors is an integer number (21221071050991).

Almost surely, 2^{42442142101981} is an apocalyptic number.

It is an amenable number.

42442142101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

42442142101981 is an equidigital number, since it uses as much as digits as its factorization.

42442142101981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 43.

The spelling of 42442142101981 in words is "forty-two trillion, four hundred forty-two billion, one hundred forty-two million, one hundred one thousand, nine hundred eighty-one".