42270121 has 2 divisors, whose sum is σ = 42270122. Its totient is φ = 42270120.

The previous prime is 42270101. The next prime is 42270167. The reversal of 42270121 is 12107224.

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., 39501225 + 2768896 = 6285^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 42270121 - 2¹¹ = 42268073 is a prime.

It is not a weakly prime, because it can be changed into another prime (42270101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21135060 + 21135061.

It is an arithmetic number, because the mean of its divisors is an integer number (21135061).

Almost surely, 2^42270121 is an apocalyptic number.

It is an amenable number.

42270121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42270121 is an equidigital number, since it uses as much as digits as its factorization.

42270121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 42270121 is about 6501.5475849985. The cubic root of 42270121 is about 348.3462692682.

Adding to 42270121 its reverse (12107224), we get a palindrome (54377345).

The spelling of 42270121 in words is "forty-two million, two hundred seventy thousand, one hundred twenty-one".