42217207 has 4 divisors (see below), whose sum is σ = 42254136. Its totient is φ = 42180280.

The previous prime is 42217181. The next prime is 42217211. The reversal of 42217207 is 70271224.

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

It is a cyclic number.

It is not a de Polignac number, because 42217207 - 2⁷ = 42217079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42217237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16693 + ... + 19054.

It is an arithmetic number, because the mean of its divisors is an integer number (10563534).

Almost surely, 2^42217207 is an apocalyptic number.

42217207 is a deficient number, since it is larger than the sum of its proper divisors (36929).

42217207 is a wasteful number, since it uses less digits than its factorization.

42217207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36928.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 42217207 is about 6497.4769718715. The cubic root of 42217207 is about 348.2008545665.

It can be divided in two parts, 42217 and 207, that added together give a palindrome (42424).

The spelling of 42217207 in words is "forty-two million, two hundred seventeen thousand, two hundred seven".