42730390121 has 2 divisors, whose sum is σ = 42730390122. Its totient is φ = 42730390120.

The previous prime is 42730390097. The next prime is 42730390147. The reversal of 42730390121 is 12109303724.

42730390121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38518380121 + 4212010000 = 196261^2 + 64900^2 .

It is a cyclic number.

It is not a de Polignac number, because 42730390121 - 2³⁴ = 25550520937 is a prime.

It is not a weakly prime, because it can be changed into another prime (42730399121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21365195060 + 21365195061.

It is an arithmetic number, because the mean of its divisors is an integer number (21365195061).

Almost surely, 2^42730390121 is an apocalyptic number.

It is an amenable number.

42730390121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42730390121 is an equidigital number, since it uses as much as digits as its factorization.

42730390121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

Adding to 42730390121 its reverse (12109303724), we get a palindrome (54839693845).

The spelling of 42730390121 in words is "forty-two billion, seven hundred thirty million, three hundred ninety thousand, one hundred twenty-one".