42231121 has 2 divisors, whose sum is σ = 42231122. Its totient is φ = 42231120.

The previous prime is 42231113. The next prime is 42231131. The reversal of 42231121 is 12113224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27300625 + 14930496 = 5225^2 + 3864^2 .

It is a cyclic number.

It is not a de Polignac number, because 42231121 - 2³ = 42231113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42231095 and 42231104.

It is not a weakly prime, because it can be changed into another prime (42231131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21115560 + 21115561.

It is an arithmetic number, because the mean of its divisors is an integer number (21115561).

Almost surely, 2^42231121 is an apocalyptic number.

It is an amenable number.

42231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

42231121 is an equidigital number, since it uses as much as digits as its factorization.

42231121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 42231121 is about 6498.5476069657. The cubic root of 42231121 is about 348.2391038561.

Adding to 42231121 its reverse (12113224), we get a palindrome (54344345).

The spelling of 42231121 in words is "forty-two million, two hundred thirty-one thousand, one hundred twenty-one".