42209324881 has 2 divisors, whose sum is σ = 42209324882. Its totient is φ = 42209324880.

The previous prime is 42209324879. The next prime is 42209324893. The reversal of 42209324881 is 18842390224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40427134225 + 1782190656 = 201065^2 + 42216^2 .

It is a cyclic number.

It is not a de Polignac number, because 42209324881 - 2¹ = 42209324879 is a prime.

It is a super-2 number, since 2×42209324881² (a number of 22 digits) contains 22 as substring.

Together with 42209324879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42209324981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104662440 + 21104662441.

It is an arithmetic number, because the mean of its divisors is an integer number (21104662441).

Almost surely, 2^42209324881 is an apocalyptic number.

It is an amenable number.

42209324881 is a deficient number, since it is larger than the sum of its proper divisors (1).

42209324881 is an equidigital number, since it uses as much as digits as its factorization.

42209324881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 42209324881 in words is "forty-two billion, two hundred nine million, three hundred twenty-four thousand, eight hundred eighty-one".