42312221 has 8 divisors (see below), whose sum is σ = 50902080. Its totient is φ = 34358688.

The previous prime is 42312217. The next prime is 42312239. The reversal of 42312221 is 12221324.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42312221 - 2² = 42312217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42312211) 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 7 ways as a sum of consecutive naturals, for example, 158936 + ... + 159201.

It is an arithmetic number, because the mean of its divisors is an integer number (6362760).

Almost surely, 2^42312221 is an apocalyptic number.

It is an amenable number.

42312221 is a deficient number, since it is larger than the sum of its proper divisors (8589859).

42312221 is a wasteful number, since it uses less digits than its factorization.

42312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318163.

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

The square root of 42312221 is about 6504.7844699114. The cubic root of 42312221 is about 348.4618789983.

Adding to 42312221 its reverse (12221324), we get a palindrome (54533545).

The spelling of 42312221 in words is "forty-two million, three hundred twelve thousand, two hundred twenty-one".