42040301221081 has 2 divisors, whose sum is σ = 42040301221082. Its totient is φ = 42040301221080.

The previous prime is 42040301221073. The next prime is 42040301221147. The reversal of 42040301221081 is 18012210304024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33119058167056 + 8921243054025 = 5754916^2 + 2986845^2 .

It is a cyclic number.

It is not a de Polignac number, because 42040301221081 - 2³ = 42040301221073 is a prime.

It is a super-2 number, since 2×42040301221081² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42040301201081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21020150610540 + 21020150610541.

It is an arithmetic number, because the mean of its divisors is an integer number (21020150610541).

Almost surely, 2^{42040301221081} is an apocalyptic number.

It is an amenable number.

42040301221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42040301221081 is an equidigital number, since it uses as much as digits as its factorization.

42040301221081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The spelling of 42040301221081 in words is "forty-two trillion, forty billion, three hundred one million, two hundred twenty-one thousand, eighty-one".