42215251 has 8 divisors (see below), whose sum is σ = 46103904. Its totient is φ = 38418240.

The previous prime is 42215237. The next prime is 42215269. The reversal of 42215251 is 15251224.

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

It is a cyclic number.

It is not a de Polignac number, because 42215251 - 2⁵ = 42215219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42215291) 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, 21946 + ... + 23791.

It is an arithmetic number, because the mean of its divisors is an integer number (5762988).

Almost surely, 2^42215251 is an apocalyptic number.

42215251 is a deficient number, since it is larger than the sum of its proper divisors (3888653).

42215251 is a wasteful number, since it uses less digits than its factorization.

42215251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45821.

The product of its digits is 800, while the sum is 22.

The square root of 42215251 is about 6497.3264501639. The cubic root of 42215251 is about 348.1954768904.

Adding to 42215251 its reverse (15251224), we get a palindrome (57466475).

The spelling of 42215251 in words is "forty-two million, two hundred fifteen thousand, two hundred fifty-one".