42215321 has 4 divisors (see below), whose sum is σ = 44437200. Its totient is φ = 39993444.

The previous prime is 42215311. The next prime is 42215323. The reversal of 42215321 is 12351224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42215321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42215293 and 42215302.

It is not an unprimeable number, because it can be changed into a prime (42215323) 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, 1110911 + ... + 1110948.

It is an arithmetic number, because the mean of its divisors is an integer number (11109300).

Almost surely, 2^42215321 is an apocalyptic number.

It is an amenable number.

42215321 is a deficient number, since it is larger than the sum of its proper divisors (2221879).

42215321 is a wasteful number, since it uses less digits than its factorization.

42215321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221878.

The product of its digits is 480, while the sum is 20.

The square root of 42215321 is about 6497.3318369928. The cubic root of 42215321 is about 348.1956693459.

Adding to 42215321 its reverse (12351224), we get a palindrome (54566545).

The spelling of 42215321 in words is "forty-two million, two hundred fifteen thousand, three hundred twenty-one".