42215111 has 4 divisors (see below), whose sum is σ = 42907224. Its totient is φ = 41523000.

The previous prime is 42215101. The next prime is 42215123. The reversal of 42215111 is 11151224.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42215111 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 42215111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42215101) 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, 345965 + ... + 346086.

It is an arithmetic number, because the mean of its divisors is an integer number (10726806).

Almost surely, 2^42215111 is an apocalyptic number.

42215111 is a deficient number, since it is larger than the sum of its proper divisors (692113).

42215111 is an equidigital number, since it uses as much as digits as its factorization.

42215111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692112.

The product of its digits is 80, while the sum is 17.

The square root of 42215111 is about 6497.3156764929. The cubic root of 42215111 is about 348.1950919788.

Adding to 42215111 its reverse (11151224), we get a palindrome (53366335).

The spelling of 42215111 in words is "forty-two million, two hundred fifteen thousand, one hundred eleven".