42215551 has 16 divisors (see below), whose sum is σ = 49772800. Its totient is φ = 35054208.

The previous prime is 42215531. The next prime is 42215581. The reversal of 42215551 is 15551224.

It is not a de Polignac number, because 42215551 - 2⁷ = 42215423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42215531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41335 + ... + 42343.

It is an arithmetic number, because the mean of its divisors is an integer number (3110800).

Almost surely, 2^42215551 is an apocalyptic number.

42215551 is a deficient number, since it is larger than the sum of its proper divisors (7557249).

42215551 is a wasteful number, since it uses less digits than its factorization.

42215551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198.

The product of its digits is 2000, while the sum is 25.

The square root of 42215551 is about 6497.3495365418. The cubic root of 42215551 is about 348.1963016982.

Adding to 42215551 its reverse (15551224), we get a palindrome (57766775).

The spelling of 42215551 in words is "forty-two million, two hundred fifteen thousand, five hundred fifty-one".