42217451 has 4 divisors (see below), whose sum is σ = 42283752. Its totient is φ = 42151152.

The previous prime is 42217423. The next prime is 42217463. The reversal of 42217451 is 15471224.

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 42217451 - 2⁶ = 42217387 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 42217451.

It is not an unprimeable number, because it can be changed into a prime (42217471) 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, 32186 + ... + 33471.

It is an arithmetic number, because the mean of its divisors is an integer number (10570938).

Almost surely, 2^42217451 is an apocalyptic number.

42217451 is a deficient number, since it is larger than the sum of its proper divisors (66301).

42217451 is an equidigital number, since it uses as much as digits as its factorization.

42217451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66300.

The product of its digits is 2240, while the sum is 26.

The square root of 42217451 is about 6497.4957483634. The cubic root of 42217451 is about 348.2015253897.

Adding to 42217451 its reverse (15471224), we get a palindrome (57688675).

The spelling of 42217451 in words is "forty-two million, two hundred seventeen thousand, four hundred fifty-one".