42322121 has 4 divisors (see below), whose sum is σ = 42338244. Its totient is φ = 42306000.

The previous prime is 42322087. The next prime is 42322123. The reversal of 42322121 is 12122324.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5112121 + 37210000 = 2261^2 + 6100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42322121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42322121.

It is not an unprimeable number, because it can be changed into a prime (42322123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3110 + ... + 9711.

It is an arithmetic number, because the mean of its divisors is an integer number (10584561).

Almost surely, 2^42322121 is an apocalyptic number.

It is an amenable number.

42322121 is a deficient number, since it is larger than the sum of its proper divisors (16123).

42322121 is a wasteful number, since it uses less digits than its factorization.

42322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16122.

The product of its digits is 192, while the sum is 17.

The square root of 42322121 is about 6505.5454037306. The cubic root of 42322121 is about 348.4890539965.

Adding to 42322121 its reverse (12122324), we get a palindrome (54444445).

The spelling of 42322121 in words is "forty-two million, three hundred twenty-two thousand, one hundred twenty-one".